How many times can you subtract 2 from 21 without getting a negative number as a!

Question:

How many times can you subtract 2 from 21 without getting a negative number as an answer?

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Answers: 1 time
21-2=19
after that you would not be subtracting from 21 anymore.

or it would be 10.5 times and that would leave you with 0 ten, i think philosophically, Jason's right...

but I go for 10 times, then having 1 left I would Love to answer this question but I have more important things to do, Like polishing my bootlaces. 10 10.5 the answer is none. if 2-21, you already get negative result

:) i think its ten times.
is it? As many times as you like. 21-2 always equals 19, no matter how many times you try it!

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