If n is divisible by both 5 and 6, then it should be divisible by 30 (5 * 6). Considering you are asking for only two-digit numbers, the answer(s) would be 30, 60, and 90. So, three numbers.
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Eight of them.
6 (15,30,45,60,75,90)
No. Numbers divisible by 2 have a digit in the ones place that is divisible by 2. In others words, numbers ending in 0,2,4,6, or 8
None. Extremely simple proof: To be divisible by 5 the units digit must be 5. But then it would not be divisible by 2.
There are five numbers: 18, 36, 54, 72, 90.