A number is divisible by 5 and 6.

Let number be a = 5× 6× b (where b is any random number)

A. a = 5× 6× b

= 5× 2× 3× b

= 10× 5× b

Hence, it is divisible by 10.

B. a = 5× 6× b

= 5× 2× 3× b

= 2×15× b

Hence, it is divisible by 15.

C. a = 5× 6× b

= 30× b

Hence, it is divisible by 30.

D. a = 5× 6× b

= 30× b

It can’t be written as 60× b and hence it may not divisible by 60.