Question

In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 18 years replaced by a new boy. the age of the new boy is

Answer 1

$\frac{ \frac{ = 0 { {?}^{2} }^{?} \times \frac{?}{?} \times \frac{?}{?} \times \frac{?}{?} }{?} }{?} \times \frac{?}{?}$