Question

The mean marks (out of 100) of boys and girls in an examination are 70 and 73 respectively. If the mean marks for all the students in the examination is 71, find the ratio of the number of boys to the number of girls

Answer 1

Step-by-step explanation:

Mean marks of boys=70

Mean marks of girls=73

Let no. of boys=x

Let no. of girls=y

Combined mean of (x+y)=71

Acc. to condition:

70x+73y=71(x+y)

70x+73y=71x+73y

73y-71y=71x-70x

2y=1x

x/y=2/1

x:y=2:1

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Answer 2

Answer:

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Step-by-step explanation: