Question

In a certain class, the ratio of the number of girls to the number of boys is 2 to 5. If 2 more girls were to enter the class, the ratio would be 1 to 2. How many students are there in the class?

• A. 28
• B. 12
• C. 21
• D. 35

Answer 1

The correct option is A 28

No. of girls =2a;

No. of boys = 5a;

New ratio = (2a+2):5a = 1:2;

2$\times$(2a+2) = 5a; a = 4;

Total students = 2a+5a = 7a =28;