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A number that is divisible by 15 is divisible both by 5 and 3

A number is divisible by 5 if it ends with 0 or 5

A number is divisible by 3 if the sum of its digits is divisible by 3

e.g. 4035 is divisible by 15 as it ends with a 5 and 4+0+3+5=12 which is divisible by 3

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Q: How do you know that a number is divisible by 15?
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