Question

Average age of some boys are 15 years. one of them 17 years boy has left and the rest of boys have average age 14.5 years. Find the number of boys

Answer 1

Step-by-step explanation:

let the number of boys x .

average ages of remaining boys = 15x-17

15x-17= x-1*14.5

15x-17= 14.5x-14.5

.5x=2.5

x=5

hence, no. of boys = 5