Question

The average age of 25 boys in a class decreases by 6 months when a new boy takes the place of a 20 year old boy. The age of the new boy is?

Answer 1

Answer:

7.5 years

Step-by-step explanation:

Total reduction in age = 25 x 6 / 12 = 12.5 years

Age of the new boy = 20 - 12.5 = 7.5 years

Answer 2

Answer : 7.5 yr

Step-by-step explanation:

Total reduction in age = 25*6/12

= 12.5 yr

Age of the new boy = 20-12.5

= 7.5 yr