Complete the following series 10,15,20,25,_______ ?

Complete the following series 10,15,20,25,_______ ?

Explanation

The first 5 multiples of 5 are 5, 10, 15, 20, and 25. These can be written as:
5 × 1 = 5
5 × 2 = 10
5 × 3 = 15
5 × 4 = 20
5 × 5 = 25

5*6=30