How many times can you subtract 10 from 39?

"How many times can you subtract 10 from 39?" 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 10 from 39 once, you are left with 29. Thus, you cannot subtract 10 again from 39.

Answer 2: 3.9 times
3.9 times, because 39 divided by 10 is 3.9. After you subtract 10, 3.9 times from 39, then there is nothing left to subtract from.

Answer 3: Infinite
There is nothing that says you can't keep subtracting 10 from 39 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 10 from 40?
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