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

Answer

`2:1`

Explanation

Let the required ratio be x:1 then,
` 70x +73 xx 1 = 71 xx (x +1)`
` Rightarrow 70x + 73 = 71x +71 Rightarrow x =2`
Hence, the ratio of boys and grils is 2:1