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 options:  A) 21:24  B) 21:24  C) 21:22  D) 21:45  E) 21:97
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).   i.e., (120/100 * 7x) and (110/100 * 8x)   i.e., 42x/5 and 44x/5   Required ratio = 42x/5 : 44x/5 = 21:22   Answer: 21:22
<result>C</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?