Aptitude Hack#75(9-5-19)

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?
  
 A )   50
 B )   51 
 C )   41  
 D )   40

Answer : D) 40

Explanation :

 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