In a class there are 24 boys whose average age is decreased by 3 months, when one boy aged 20 years is replaced by a new boy. Find the age of the new boy?(CTS COMPANY)

In a class there are 24 boys whose average age is decreased by 3 month

1.	In a class there are 24 boys whose average age is decreased by 3 months, when one boy aged 20 years is replaced by a new boy. Find the age of the new boy?(CTS COMPANY)
A.	16 years
B.	14 years
C.	18 years
D.	17 years
Answer» C. 18 years