Question

the average age of a class of 40 boys in 16.9 five years but by the admission of a new boy the average age is ways to be 17 years find the age of the new boy​

Answer 1

Answer:

Sum of age of 40 boys = 16×40=640

New age of 40 boys = 15.875×40=635

Difference = 640 - 635 = 5 years

17 - x = 5

x = 17 - 5 = 12 years