Aptitude Hack#81(15-5-19)

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