Question

If average age of 40 boys is 17 years and a new boy admission the average age now 17.05year find new student age

Answer 1

if average of 17 total age of 40 students = 17 x 40 = 680

If average is 17.05 total age 41 students = 17.05 x 41 = 699.05

New student's age = 699.05 - 680 = 19.05years old