A sum of Rs. 312 was divided among 100 boys and girls in such a way that each boy gets Rs. 3.60 and each girl Rs. 2.40. The number of girls is:
50
Step (i): Let x be the number of boys and y be the number of girls.
Given total number of boys and girls = 100
Step (ii): A boy gets Rs. 3.60 and a girl gets Rs. 2.40
The amount given to 100 boys and girls = Rs. 312
Step (iii):
Solving (i) and (ii)
= 40
Number of girls = 40