Question

6. 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 YT
2) 7.5 y
(3) 8 yr
(4) 8.5​

Answer 1

Answer:

2) 7.5 years. Please mark me as brainliast. Hope it helps.

Step-by-step explanation:

New boy of age 'y' years is added and an old boy of age 20 years is removed. Also, in the question, it is told that the average age of 25 boys decreases by 6 months ( 0.5 years), when the substitution takes place. Thus, the avg. age of new boy is 7.5 years. Please mark me as brainliast. Hope it helps.