Question

find the sum of all 3 digits divisible by 3 and 5 both.

Answer 1

Answer:

The lowest 3 digit number divisible by 15 is 105 (or 15*7). The highest number that is divisible by 15 and still 3 digits is 990 (which is 15*66). Therefore any number that is 3 digits and divisible by 3 and 5 can be expressed by 15*n, where 7 <= n <= 66