Question

. In a class the average age of 50 boys is 16 years, 6 months; and that of girls is 15 years. The
average age of whole class is 15 years and 6 months. The number of girls in the class is given by
A) 75
B) 240
C) 100
D) 150​

Answer 1

Answer:

Correct option is

B

15.5 years

Let No of boys = No of girls = x

Avg age of whole class =

x+x

16×x+15×x

=

2

16+15

=15.5 years