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Ratio of number of girls to the number of boys = 2:7 Sum of the terms of the ratio = 2 + 7= 9 The number of girls in the school =
x 990 = 220 and the number of boys in the school =
x 990 = 770 Let the number of new girls admitted be x, then the number of girls become (220 + x) After 20 boys leave the school, the number of boys become (770 -20) i.e. 750 According to given,
220 + x = 3
150
220 + x = 450
x = 230
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