Question

The ratio of number of girl to the number of boys in a class is 7:5. If there are 15 boys in the class,then the number of girls in the class is
(a)14

(b)21

(c)28

(d)36​

Answer 1

(b) 21 is your ans ........

..

Answer 2

Answer:

$girls = 7x \\ boys = 5x \\ given \: boys \: = 15 \\ 5x = 15 \\ x = 3 \\ 7x \: =7 \times 3 \\ = 21$