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2015-08-23T20:06:17+05:30

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Ratio = 7  : 8
let number of boys be = 7 x
let number of girls = 8 x

increase in number of boys = 7 x * 20/100 = 14 x /10
total number of boys now :  7x + 14 x/10 = 8.4 x

increase in number of girls = 8 x * 10/100
 total number of girls now : 8 x + 8 x /10 = 8.8 x

the ratio = 8.4 x : 8.8 x   = 21 : 22     

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