Question

the sum of 3 consecutive multiples of 5 is 555 find the number

Answer 1

Let us assume that the three consecutive multiples of 5 as below:

a, a+5, a+10

The total sum of the three numbers = 555.

a + a + 5 + a + 10 = 555

3a + 15 = 555

3a = 555 – 15 = 540

a = 540 / 3 = 180

a = 180

So, the three numbers are 180, 185 and 190.

Answer 2

first multiple =x
2nd =x+5
3rd =x+10
x+x+5+x+10=555
3x=555-15
x=540/3
=180

3 consecutive multiples are 180,185,190