In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 21 years replaced by a new boy. The age of the new boy is?
Pick.
A) 14 years 8 months  B) 15 years  C) 16 years 4 months  D) 17 years 8 months  E) 17 years
Total decrease = (20 x 2) months   = 3 years 4 months   Age of the new boy   = 21 years - 3 years 4 months.   = 17 years 8 months.   ANSWER:17 years 8 months
<result>D</result>
In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 21 years replaced by a new boy. The age of the new boy is?