No, 15 is not divisible by 9. If you have any further questions I recommend using a calculator.
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No, to determine if a number is divisible by nine, add up the digits. If the sum is divisible by 9, then the number is divisible by 9. So 519 -> 5 + 1 + 9 = 15, which is not a multiple of nine. This 'trick' works on divisible by 9 and also divisible by 3, so 519 is divisible by 3, since 5 + 1 + 9 = 15, which is a multiple of 3. Yes. The result is a fraction though.
45
Nope - in order for a number to be divisible by 9, the sum of its digits must also be divisible by 9. In this case, the digits 2+4+2+7=15.
135/9 = 15
None of them. 15 is divisible by 3 and 5