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

Explanation

To solve the problem, we will follow these steps:

### Step 1: Define the variables
Let:
- \( n_1 \) = number of boys
- \( n_2 \) = number of girls
- \( x_1 \) = mean marks of boys = 70
- \( x_2 \) = mean marks of girls = 73
...