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
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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
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