• # question_answer 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? A)  8 : 9                            B)  17 : 18C)  21 : 22      D)  can't be determined

(c): Let nos be $7x,8x$ After increase, Boys$=7x\times 1.2=8.4x$ Girls = $8x\times 1.1=8.8x$ New ratio = $\frac{8.4x~}{8.8x}=\frac{21}{22}$.