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# Subtraction

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Subtraction - Back to the River Crossing Puzzles

How many times can you subtract the number 2 from the number 32?

This old topic is locked since it was answered many times. You can check solution in the Spoiler below.

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Subtraction - solution

Once. After you subtract 2 from 32, you subtract 2 from 30, from 28, and so on.

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Posted · Report post

ha...

ha...

good one.

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Posted · Report post

Well, you can subtract 2 from 32 as many times as you want.

32 - 2 = 30 (first time)

32 - 2 = 30 (second time)

and so on...

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Posted · Report post

hehehe....

even more funny!!

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My answer is once, because "32" without the "2" would be "3" and you can't remove a "2" from a "3".

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Posted · Report post

If you only want to work w/ positive #s, 2 can be substracted frrom 32 16 times till you get to 0:

30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0

Otherwise you can subtract 2 from 32 an unlimited # of times. Just go into negatives:

10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10

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Posted · Report post

If you only want to work w/ positive #s, 2 can be substracted frrom 32 16 times till you get to 0:

30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0

Otherwise you can subtract 2 from 32 an unlimited # of times. Just go into negatives:

10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10

You don't seem to get the gist of the riddle. It's not a math problem. You can only subtract 2 from 32 once because after that you are subtracting 2 from a number that isn't 32.

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Posted · Report post

I Agree with Grujah.

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Infinite

32-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2...

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Posted · Report post

That reminds me of these riddles:

How many cookies can you eat with an empty stomach? 1!

How many books can fit in an empty schoolbag? 1!

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Posted · Report post

ha its good one though but im lost on the Cookie and Books now, can u not b able to fit in loads not just 1?..

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When you eat one cookie your tummy is no longer empty. When you put in 1 book, the bag is no longer empty.

Geddit now?

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Posted · Report post

Only once.

After 2 is subtracted from 32, it becomes 30. But we're not subtracting 2 from 30, now are we?

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Posted · Report post

This isn't a riddle - it's just stupid.

But even if it were a little more clever, there are so many "correct" answers (infinite, once b/c then it's 30, once b/c then all you have is a 3...) that there's no way to know which one is ultimately going to be considered the right answer.

Don't get me wrong, most of the riddles on this site are good - this one is just so below par I felt compelled to criticize.

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Posted · Report post

This isn't a riddle - it's just stupid.

But even if it were a little more clever, there are so many "correct" answers (infinite, once b/c then it's 30, once b/c then all you have is a 3...) that there's no way to know which one is ultimately going to be considered the right answer.

Don't get me wrong, most of the riddles on this site are good - this one is just so below par I felt compelled to criticize.

I like the riddle. I like putting this type in between deep logic puzzles - just to remember you that some things are quite simple

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There is one idea no one has considered. Consider 32 as the magnitude of a vector. If you think about 2 as the magnitude of another vector, then subtracting can result in a vector with magnitude between 30 and 34 inclusive. Using this logic, there are 2 vectors of length 2, which when subtracted from the vector of magnitude 32 result in another vector of magnitude 32. This means you could subtract different vectors of magnitude 2 from many vectors of magnitude 32 an infinite number of times.

I realize this is not the point of the riddle. I just thought it might be interesting.

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Posted · Report post

16!!!! OBVIOUSLY, IF YOU TAKE THE TIME TO DO THE MATH THAT IS THE ANSWER.

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only once after you subtract 2 from 32 it isn't 32 any more

THANK YOU, THANK YOU

I ACCEPT DONATION

ahhh i hate when there are 2 page and i dont notice

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Posted · Report post

i do love how my brain will go: it should be this... hang on wait a minute that can't be right...

you can only 2 from 32 once

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I've fallen for this one once, but that was a long time ago... Ofcourse you can subtract 2 from 32 only ONCE, since after that, it's no longer 32 you're subtracting from

BoilingOil

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Posted · Report post

you can subtract 2 from 32 = 16 times

32-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2=0

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once!!!i knew this already cus one of my teachers was like, how many times can you sub 5 from 25. that was like last week too.

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Hi!! You may substract 2 from 32 only once!

Why because after subtracting 2 from 32 once you no longer have 32 but you have just 30

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Well, you can only subtract 2 from 32 once. Once you've done that, then you'd be subtracting 2 from 30, then 28...etc.

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come on. everyone knowes that 2 can be subtracted from 32 16 times unless you go into the negitives. and for idiots, 32-2=30, as many times as you want DUH

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