How many times can you subtract 4 from 20?

"How many times can you subtract 4 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 4 from 20 once, you are left with 16. Thus, you cannot subtract 4 again from 20.

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

Answer 3: Infinite
There is nothing that says you can't keep subtracting 4 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 4 from 21?
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