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How many multiples of 3 are there between -40 and 40?

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How many multiples of 3 are there between -40 and 40?

by Max@Math Revolution » Fri Sep 30, 2016 6:38 am
How many multiples of 3 are there between -40 and 40?
A. 13 B. 17 C. 23 D. 26 E. 27
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by Max@Math Revolution » Sun Oct 02, 2016 2:52 am
==> The number of multiples of three between 1 and 40 is 13, and the number of multiples of 3 between -1 and -40 is also 13. However, since 0 is a multiple of all integers, 13+13+1=27. Hence the answer is E.
Answer: E
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