Question

The average age of 21 boys is 29 years. When one boy leaves the average age increased by 1/4 year. How old is the boy who leaves?

Answer 1

Answer:

Step-by-step explanation:

the average age of 21 boy = 29

total  age 21*29 = 609

one boy leaves,  remainng 20 boys ,average age increase by 1/4

note :

1/4 = 0.25,so 29.25

remaining boys : 20*29.25 = 585

one boy leave age is  609 - 585  = 24