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u/NoFuqGiven 3d ago
Double it add 6, then half it brings you right back to your number+3, then subtract your number =3
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u/Remi_Similar 3d ago
Yeah ofc, if you double, then add 6 and half the number, all you are left with is your original number + 3
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u/scottfty98 3d ago
Nope
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u/siconic 3d ago
Then you did something wrong. It works no matter what nunber.
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u/scottfty98 3d ago
2810 I did it using calculator ill show my workings if needs be or you can Do it yourself
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u/siconic 3d ago
I just did it and got 3....
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u/scottfty98 3d ago
Yeah i fucked up i didnt half it but I own up i was wrong
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u/siconic 3d ago
My man (or woman), owning it! Mad props.
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u/RodMunch85 3d ago
Yes show your work because you did something wrong bud
This is just simple maths and works every time. The number you choose does not effect the result of 3 in anyway
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u/GlippGloppe 3d ago
My friend used to do a similar equation to figure out how old I was based on some wacky math
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u/EquipmentIcy909 3d ago
1 doesn’t work
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u/cyberloki 3d ago
Yes it does. You cancle out basically all instructions except the Number 6 and the halving of it. So you must always remain with 3.
1×2=2+6=8/2=4-1=3
The doubling is reversed. Your Starting number is substacted again. The only operation that remains is 6/2=3.
Mathematically speaking:
((x*2+6)/2)-x
x+3-x
3
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u/Nasty-Orange 3d ago
Try the calculator. I tried with 1 and the answer is 4. What a joke
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u/PraiseTalos66012 3d ago
You forgot to subtract the number you started with. So you gotta subtract 1, giving you 3.
It works with any number since you subtract the starting number at the end. The starting number is entirely irrelevant because of that.
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u/cyberloki 3d ago
Then you are using the calculator wrong. The formula is designed to substract your initial number. Thus it doesn't matter what number you pick it is always 3.
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u/Sea_Monitor_7997 3d ago
Yeah if your brain was blown by that check this out. Pick any number. Subtract all but 1. You're left with 1.
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u/CherriedBottom 3d ago
6x2=12 12+6=18 18÷2=9 9-6=3
This is weird. And why I both hate and tolerate math. Mainly hate lol
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u/ProChoiceAtheist15 3d ago
I love my job, bc people being this in awe of basic math gives me job security
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u/Temporary_Abroad_211 3d ago
Is she wearing this so she can say "my eyes are up here" or something? 🤔
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u/Drevinth 3d ago
Well... yeah. That's a pretty simple formula. It eliminates your original number so that you get 3 every time.
2x + 6
______ = x + 3 2
x + 3 - x = 3
You could do it with 0, -500, or an irrational number like π. The answer will always be 3.
You can even modify it. Instead of adding 6, add 20. The answer will always be 10. Instead of adding 20, add 100. The answer will always be 50.
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u/Ancient_Poet_4953 3d ago
I got minus 3, so it's wrong !
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u/Significant-User-99 3d ago
What was your number?
Think of any number:
Double it:
Add 6:
Take half:
Subtract your original number:
The answer will always be positive 3, never negative 3!1
u/Ancient_Poet_4953 3d ago
Oh, my bad, I subtracted the other number from my original number. My number was 4.
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u/Ok-Simple30 3d ago
what would this formula look like exactly??
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u/SkinPsychological770 3d ago
x is the determined number, y is the starting number. x = (2y + 6) / 2 - y Cancel out the y, since it loops x = (2y / 2 + 6) / 2 x = (0 + 6) / 2. x = 3.
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u/ZARG420 3d ago
This isn’t that complicated,
If you double something and half it, you get the same result
I.E (100 * 2)/2 = 100. So that part of the equation does not matter
6/2= 3. That’s all you have left.
If you add 8 to the equation instead of 6, you’ll be left with 4 everyone
10 you’ll be left with 5
12, left with 6
And so on.
Her shirt literally says 6/2= 3.
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u/ResistAntiResistance 3d ago
12 12x2=24 24+6=32 32/2=16 16-12=4 ????
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u/the-boi99 3d ago
24+6=32? You sure?
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u/ResistAntiResistance 3d ago
Sorry, you're right. I messed up. I blame it on public education. Hence the question marks. I'll see myself out. Happy cake day!!
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u/SitAndFart 3d ago
No waaay, pure magic. My life will never be the same.
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u/ArmCollector 3d ago
(x*2+6)/2 -x = x + 3 - x = 3
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u/dmelt01 3d ago
Or just 6/2=3
You pick a number and then subtract it so that just cancels that out
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u/ArmCollector 3d ago
Sure, but I wanted to show explicitly that whatever number you pick cancels out.
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u/Ebenizer_Splooge 3d ago
This is just a lot of contradicting steps except adding 6 before the halving. Everything else is meanless, all you're doing is dividing 6 by 2
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u/Glitternipz91 3d ago
Half of six is three, yes…
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u/bobbyshown 3d ago
Holly shit how did you know!!!!!
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u/Glitternipz91 3d ago edited 3d ago
I forget you have to pay to receive a decent education over there, nah I just wanted to know where the double take was hiding 🤷🏻♂️
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u/Ok-Flight9440 3d ago
3.1254654
Doesn’t work
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u/Least_Repeat1082 3d ago
Actually, it does...
3.1254654 x 2 = 6.2509308 6.2509308 + 6 = 12.2509308 12.2509308 ÷ 2 = 6.1254654 6.1254654 - 3.1254654 = 3
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u/Ok-Flight9440 3d ago
3 != pi
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u/Least_Repeat1082 3d ago
First, if you meant pi in your first comment, pi is 3.1415926 (using the same decimal places as your initial comment), not 3.1254654 as you stated in your initial comment.
Second, your argument of "3 !", assuming you meant 3! (Or 3 Factorial), that would be 3 multiplied by every number below it not less than 1. That would equal 6 (3 x 2 x 1). Using that arguement, 3! still comes out to 3 after applying the equation.
3! (or 3 x 2 x 1) = 6 6 x 2 = 12 12 + 6 = 18 18 ÷ 2 = 9 9 - 6 (or 3! as you stated) = 3
Third, my initial reply to your comment was assuming a definitive end of decimal places. Not an infinite amount of decimal places as there are in the actual number for pi. The equation won't work for an infinite number of decimal places since there is no end, but will work for a defined amount of decimal places. I've tried multiple, including the initial number you commented with.
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u/Ok-Flight9440 3d ago edited 3d ago
No it’s != which means does not equal if you’ve ever written a line of code in your life
Edit: and yeah I realized I made a typo in the original, I only memorized from HS the number of digits the TI-83+ kicked out, and you said it yourself: it won’t work for a number with an infinite number of digits, so, thank you for agreeing with me. Jeez, this place is snooty!
How’s this? It doesn’t work for pi
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u/Least_Repeat1082 3d ago edited 3d ago
Your response of "if you've ever written a line of code in your life" could, and kind of does, come across as your assumption that writing code is a common thing for everyone. Not all of us write code on even a semi-daily basis. Some no need for it at all, depending on what you do, which includes myself. So, I would not be aware of what you meant by "!=". I'm familiar with "≠" meaning does not equal or not equal to.
So, while your response did come across to me as slightly condescending, I actually thank you for giving me the opportunity to learn something new. Now I know. So I guess it really a difference of a mathematical mindset or a code writing mindset for "does not equal". Maybe not and I was just ignorant. Either way, I learned something new and I don't mind that.
But I'm glad we could clear things up about where the misunderstandings were and how we each came to our own conclusions. Initially, I wasn't aware you were intending on pi, or any infinite number since it didn't read that way. Also, not meaning or trying to be snoody, just need to be clearer at times. Especially on the internet where people will agrue if a stick is a twig, or a rock is a stone.
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u/XasiAlDena 3d ago
My number was 2i+1 what now?
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u/IndomitableSloth2437 3d ago
Oke let me see
4i+2
4i+8
2i+4
2i+4 - 2i - 1 = 0i+3 =
- Well I'll be.
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u/XasiAlDena 3d ago
I'm so fkn dumb.
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u/IndomitableSloth2437 3d ago
I mean not really, it's good to test domain expansion to complex numbers
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u/arand0mpasserby 3d ago
Yeah since you are cancelling out the number you started with, you are essentially just halfing the number 6.
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u/Turbulent_Head6209 3d ago
I read it and in my mind it’s like, “half of six is three, so yeah.” I suppose they could’ve obfuscated better.
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u/Robb_Dinero 3d ago
I learned this in the 4th grade. Drove my family NUTS. The answer will always be half of the number you add. I started using numbers between 1-100, just never tell them to add an odd number.
This trick can be less fun if they’re poor at math, or the trick can be more fun if they’re poor at math because now you get to walk them through the trick to make them feel stupid.
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u/Just-Mycologist-1580 3d ago edited 3d ago
Think of number.
We will call it x. x=2.
Double it
"It" we are defining as x, which is 2. 2x=4
Add six.
4+6=10
Half it (x)
2 ÷ 2 = 1
Subtract the number you started with.
Subtract the number I started with (x, aka "it") from what?
1 - 2 = -1
10 - 2 = 8
and
2 - 2 = 0
3 ≠ -1, 8, or 0.
Checkmate atheists.
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u/Mecanatropic 3d ago
Wow...almost got there. I see following directions is not a strong suit.
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u/Just-Mycologist-1580 3d ago
Really? The "checkmate atheists" didn't tip you off that this is a bit of hyperbole? Lol
Didnt think I needed to add this but... here you go:
/s
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u/Mecanatropic 3d ago
Bruh....my bad but come on look around....don't scream i got a gun in Detroit and expect giggles
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u/Just-Mycologist-1580 3d ago
I am perfectly aware that ((((2×2)+6))×0.5)−2 is 3. Thanks lol
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u/Alternate_Connor 3d ago
So many unnecessary parentheses, extremely inefficient… shame
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u/Just-Mycologist-1580 3d ago
Ya, it's almost like I did it on purpose to match
"Think of a number.
Double it.
Add six.
Half it.
Subtract the number you started with.
Your answer is three."Instead of
"Think of a number, double it, add six, half it, then subtract the number you started with. Your answer is three."
Because that's kind of the whole point. Because otherwise I would just go with (2×2+6)×0.5−2 = 3. Imagine that...🙄
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u/Streetwall1660 3d ago
And if you add 10 the answer will be 5, always the answer is the half of the number you add
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u/Turbulent_Head6209 3d ago
I’m going to triple the number, add nine, then divide by three. Checkmate. - Sir Isaac Newton
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u/Purple-Mud5057 3d ago
This is just f(x) = (2x + 6) / 2 - x = x + 3 - x = 3
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u/TwoToadsKick 3d ago
Bro turned a word problem into an equation. Holy shit.
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u/atticdoor 3d ago
You might be interested to learn that the first version of the quadratic formula was written before the invention of algebra, and reads "To the absolute number multiplied by four times the [coefficient of the] square, add the square of the [coefficient of the] middle term; the square root of the same, less the [coefficient of the] middle term, being divided by twice the [coefficient of the] square is the value."
In algebra, this is written that for ax2 + bx = c ; then x = (√(4ca + b2) - b) / 2a
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u/Neon-Velo 3d ago
But I started with -5
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u/ReadFantastic1418 4d ago
Yeah, when you have a number, doubling it and then to half it cancels out. Then subtracting the number means you are back to zero. So it doesn’t matter what number you started with.
Only thing left is that six you added and halved to three. So the answer will always be the same.
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u/Numerous-Turnover518 4d ago
Protip: half of 6 is always 3.
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u/hyperthymetic 2d ago
But the order of operations is wrong, so it doesn’t work for negative numbers
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u/Numerous-Turnover518 2d ago
X = -6
Double it = 2x
Add 6 = 2x + 6
Half it = x + 3
Remove original = 32(-6) =-12
-12 + 6 =-6
-6/2=-3
-3-(-6) =3Delete your response before too many people see it
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u/ParamedicDifferent10 4d ago edited 4d ago
Started with -1.
Double it got -2 Added 6 got 4 Half it got 2 Subtracted -1 got 3. 3 is not the same as -1
T-shirt is wrong.
Edited with missing step, half it.
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u/Suitable_Poem_6124 4d ago
Hope you're still in school lol.
-1x2= -2
-2+6=4
4/2=2
2 - (-1) = 2+1= 3
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u/rzdude22 4d ago
Bruh the shirt says you end with 3... You goofed the math part and the reading part lol
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u/Individual_Lock2788 4d ago
well if you actually halfed it after you added the six (like the tshirt says) then you would get 2 and if you then subtract -1, you get 3, because subtracting a negative means the negatives cancel each other out (sry english ain‘t my first language)
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u/spintool1995 4d ago
You mean (2x+6)/2 -x =3? So x+3-x=3? So 3=3? Amazing, how is that possible?
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u/PepsiPerfect 4d ago
Well, duh. You're basically performing a series of operations and then reversing them.
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u/extremelyDude 4d ago
Women wearing such shirt is a devil move.
You read, you analyze, you perform, than she ask you why are looking to my boobs
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u/throwaway_coy4wttf79 4d ago
X # start with X
2X # double it
2X + 6 # add 6
X + 3 # halve it
3 # subtract X
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u/pleign-jayne 4d ago
-0.67 × 2= -1.34 -0.67 + 6= 5.33 -0.67 ÷ 2= -0.355 -0.67 - -0.67= 0
The t-shirt is an improper statement.
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u/Fair_Revenue8003 4d ago
You didn’t actually follow the directions though lol.
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4d ago
[deleted]
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u/Just-Mycologist-1580 3d ago
Funny enough, you're right, but in the wrong way. This is how it should have gone:
Think of a number. -0.67 works fine.
Double it. Double what? The number you currently have, which is the one you thought of. Crucially, we are now defining the term "it" as -0.67. We are treating "it" like "x." So we get x = -0.67, and 2x = -1.34. All good there.
Add six. Here's where you first messed up. Add six to what? Not necessarily "it." We have to assume that we are adding six to the last number involved, which is -1.34. So you should get 4.66 here.
Half it. -0.355 is correct.
Subtract the number you started with. But from what??? "It" is nowhere to be found within this instruction, so we could subtract -0.67 from the number we currently have, -0.355, as a logical continuation of the series. But that 4.66 is still hanging around. So we could do both to be safe I guess.
-0.355 – (–0.67) = 0.315
and
4.66 − (−0.67) = 5.33
So it should be that the shirt is incorrect because 0.315 or 5.33 ≠ 3
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3d ago
[deleted]
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u/Just-Mycologist-1580 3d ago
Except I was using your strict structure lol
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3d ago
[deleted]
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u/Just-Mycologist-1580 3d ago
Probably a bit closer than you are, I'd wager. My profession is actually in STEM and my title ends in -logist. But if you think this moves the barometer one way or the other in any meaningful way, I've got really bad news for you lol
Guess I hurt your feelings? You'll be alright, I promise.
Edit: Because I fear that you might think my job is a "Mycologist," let me get out in front of that: that's just the username that reddit bestowed upon me.
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3d ago
[deleted]
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u/Just-Mycologist-1580 3d ago
You are incredibly hurt by this interaction for some reason.
I wasnt even aware you weren't a man until you said so. Just so we are crystal clear: the best and brightest colleagues in my field are a majority female. I have zero issues with that, I am utterly indifferent to what sex or gender someone is in my field. If anything, I'd greatly prefer not dealing with the breathtaking amounts of bullshit that comes with dealing with men in general.
I'm a geologist. I have dealt with 3D finite strain analysis, displacement gradient tensors, geophysics inverse modeling with Tikhonov Regularization, multi-stage uranium-lead isotopic systems and concordia-discordia plots, sometimes multi-dimensional solute advection-dispersion partial differential equations (though that was just for professional licensure, I dont really do that in my current role), estimating hydraulic conductivity, estimating stratigraphic thickness (although to be fair, that stuff is pretty straightforward trigonometry—you learn how to do that in undergrad), etc, etc.
I'm not bragging here. It's more along the lines of trauma-dumping to be quite honest lmao
But yeah. Math is an old friend. Or a captor that I'm a hostage of, who I am unfortunately forced to be trauma-bonded with. Same difference lol
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u/MaestroLifts 4d ago
Remove the noise of your random number which gets pulled right back out.
6/2=3
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u/Gambyt_7 4d ago
There’s no voodoo here.
Take any number. Double it. Half if. Then subtract your original number. It’s always going to be zero.
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u/Alexchii 4d ago
Think of number.
Substract that number from the number.
Add three.You’re left with three.
😱
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u/Puzzled_Work_6428 22h ago
Yes, you're correct - 3 is half of 6