The ratio of the number of boys to that of the girls in a school is 5 : 7. If there are 1148 girls in the school, how many boys are there in that school?

Correct option is C

Given:

Ratio of boys to girls = 5:7

Total number of girls = 1148

Solution:

Let the number of boys and girls be 5x and 7x respectively

Then 7x = 1148

​$$x= \frac{1148}{7} =164$$​​

Number of boys =$$5x = 5 \times 164 = 820$$​​