In a college, the ratio of boys to girls is 7:8. What will the new ratio be if there is a 20% rise in the number of males and 10% increase in the number of girls?
A. 8 : 9
B. 17 : 18
C. 21 : 22
D. Cannot be determined
Answer:C
In a college, the ratio of boys to girls is 7:8. What will the new ratio be if there is a 20% rise in the number of males and 10% increase in the number of girls?
A. 8 : 9 B. 17 : 18 C. 21 : 22 D. Cannot be determined
Explanation: Initially, the college should have 7x the number of males and 8x the number of girls.(120 percent of 7x) is the growth in their number (110 percent of 8x).110/100 x 8x and 120/100 x 7x42x/5 and 44x/5,42x/5 : 44x/5 = 21 : 22 is the necessary ratio.