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I tried to solve the number problem below and would like to get input on the final solution I came up with. Thanks in advance!

(a) If n is a multiple of 7, how many numbers there that are multiples of 7 between n and n + 700 (inclusively)? Answer * 101*

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    I Will do that!2011-09-07

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Every 7th number is a multiple of 7. So, the multiples bigger than $n$ are $n+7$, $n+2\cdot7$, and so on. Dividing 700 by 7 tells us that there are 100 such numbers, and we also need to count $n$ itself, giving 101.

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    Thanks. I was not sure if what I had was correct.2011-09-07