How many times can you subtract 5 from 20?

"How many times can you subtract 5 from 20?" 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 5 from 20 once, you are left with 15. Thus, you cannot subtract 5 again from 20.

Answer 2: 4 times
4 times, because 20 divided by 5 is 4. After you subtract 5, 4 times from 20, then there is nothing left to subtract from.

Answer 3: Infinite
There is nothing that says you can't keep subtracting 5 from 20 indefinitely. Just because you will end up with negative numbers doesn't mean you have to stop subtracting!

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How many times can you subtract 5 from 21?
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