How many times can you subtract 12 from 21?

"How many times can you subtract 12 from 21?" is a tricky question. We think that there are three different answers to this question.

Answer 1: Once
It is once, because after you subtract 12 from 21 once, you are left with 9. Thus, you cannot subtract 12 again from 21.

Answer 2: 1.75 times
1.75 times, because 21 divided by 12 is 1.75. After you subtract 12, 1.75 times from 21, then there is nothing left to subtract from.

Answer 3: Infinite
There is nothing that says you can't keep subtracting 12 from 21 indefinitely. Just because you will end up with negative numbers doesn't mean you have to stop subtracting!

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