How many times can you subtract 9 from 9?

"How many times can you subtract 9 from 9?" 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 9 from 9 once, you are left with 0. Thus, you cannot subtract 9 again from 9.

Answer 2: 1 times
1 times, because 9 divided by 9 is 1. After you subtract 9, 1 times from 9, then there is nothing left to subtract from.

Answer 3: Infinite
There is nothing that says you can't keep subtracting 9 from 9 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 9 from 10?
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