Question

The average age of 25 boys in a class decreases by 6 months when a new boy takes the place of a 20 yr old boy. Find the age of new boy.
(1) 7 yr
(2) 7.5 yr
(3) By
(4) 8.5 yr
​

Answer 1

Answer:

7.5 years.

Mark as brainliest please.