The ratio of the number of boys and girls in a college is 7 : 8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio?  Choose the correct choice from the following
A) 21:22 B) 17:18 C) 8:9 D) 9:8 E) None of them
Originally, let the number of boys and girls in the college be 7x and 8x respectively.   Their increased number is (120% of 7x) and (110% of 8x).   = (120/100) 7x and (110/100) 8x   = 42x/5 and 44x/5   Therefore, The required ratio = (42x/5):(44x/5)   = 21 : 22   21:22nswer is 21:22.
<result>A</result>
The ratio of the number of boys and girls in a college is 7 : 8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio?