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 answers:
A) 8 : 9	B) 21 : 22	C) 17 : 18	D) 12 : 20	E) Cannot be determined
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 x 7x)	and	(110/100 x 8x)   42x/5 and 44x/5   The required ratio = (42x/5 : 44x/5)= 21 : 22.   ANSWER 21 : 22
<result>B</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?