Because they are multiples of 5. All multiples of 5 have 5 as a factor, which means they are divisible by 5.
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15 and its multiples
Multiples of 10
Since both 3 and 5 are prime numbers, only numbers that are multiples of its product are the numbers that are divisible by both. 15 is the LCM of 3 and 5 and hence all multiples of 15 are divisible by both 3 and 5
10 is divisible by both 5 and 2, as are any multiples of 10.
60 and its multiples.