18
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If you want your answer to be a whole number, it is divisible by 2 and 5.
180 is divisible by 2, 3, 4, 5, 9, and 10.
7 is not divisible by any of them.
90
Your question is impossible to answer. Any number that is divisible by both 2 and 5 will also be divisible by 10. 30 and 60 are not divisible by 9.