The ration of the number of boys and girls in a college is 7:8. If the percentage is increase in the number of boys and girls be 20% and 10% respectively. What will be the new ration?	Choose the correct choice from the following answers:
A) 5:7 B) 15:21 C) 21:22 D) 13:17 E) 23:42
Let the number of boys and girls be 7x and 8x   their increased number is 120% of 7x and 110% of 8x   7x*120/100 and 8x*110/100   42x/5 and 44x/5   Required ratio = 42x/5 : 44x/5 = 21:22   Answer is 21:22
<result>C</result>
The ration of the number of boys and girls in a college is 7:8. If the percentage is increase in the number of boys and girls be 20% and 10% respectively. What will be the new ration?