Question

The ratio of number of boys to the number of girls in a school of 432 pupils is 5 : 4. When some new boys and girls are admitted, the number of boys increase by 12 and the ratio of the boys to girls changes to 7 : 6. The number of new girls admitted is

A) 12 B) 14 C) 24 D) 20

Answer 1

B : G = 5 : 4

9 -> 432

1 -> 48

Boys=5×48=240

Girls=48×4=192

Now Total No. of boys = 240 + 12 = 252

BG= let the no. of girls be added is

BG=76

252192+x=76

216 = 192 + x

x = 24

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