Question

48. The average age of 10 students in a class increases by 4.8 months when a boy of age 6 years is replaced by a new boy. What is the age of the new boy? (1) 8 years (3) 11 years (2) 10 years (4) 9 years 10​

Answer 1

Answer:

10 years

Total increase in age of 10 students= 10*4.8=48 months= 4 years

Age of a new boy should be 4 year more than the boy who is replaced.

age of the new boy=6+4= 10 years