The total number of students in a school is 240. If the number of boys in the school is 135, then what is the ratio of the total number of girls to the total number of boys in the school?

Correct option is C

Given:

Total number of students in the school = 240

Number of boys in the school = 135

Solution:

Number of girls = 240 – 135 =105
Now, the ratio of the number of girls to the number of boys is:

​$$\text{Ratio of girls to boys} = \frac{105}{135}$$​

​$$\text{Ratio} = \frac{105 \div 15}{135 \div 15} = \frac{7}{9}$$​