In an university college, the ratio of the number of boys and girls is 5 : 9. If the percentage increase in the number of boys and girls be 20% and 40% respectively. What will be the new ratio ?
Options
A) 21 : 10 B) 12 : 17 C) 15 : 23 D) 10 : 21 E) None of these
Explanation :   Solution: Originally, let the number of boys and girls in the university college be 5x and 9x respectively.   Their increased number is (20% of 5x) : (40% of 9x)   =&gt; (120*5x/100) : (140*9x/100) = 60x : 126x   =&gt; x : y = 10 : 21.   Answer : 10 : 21
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In an university college, the ratio of the number of boys and girls is 5 : 9. If the percentage increase in the number of boys and girls be 20% and 40% respectively. What will be the new ratio ?