Q. 93.9( 17 Votes )

The mean ma

Answer :

Let the sum of marks of boys be x and the number of boys be B

that of girls be y and G respectively

Mean marks for boys = 70

x = 70B

Mean marks for girls = 73

y = 73G

Mean marks for whole class = 71

2G = B

B:G = 2:1

So, the ratio of number of girls to the number of boys is 2: 1

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