Question

From a group of boys and girls,15 girls leave.There are then left 2 boys for each girl. After this,45 boys leave.There are then 5 girls for each boy.Find the number of girls in the beginning?

Answer 1

Let at present there be x boys.

Then, no of girls at present = 5x 

Before the boys had left:no of boys = x+45 

And no of girls=5x 

X+45=2*5x 

9x=45 

x=5 

no of girls in the beginning=25+15=40