In a class of 49 students, the ratio of girls to boys is 4:3. If 4 girls leave the class, the ratio of girls to boys would be

  1. 11:7
  2. 8:7
  3. 6:5
  4. 9:8

Answer

Let the number of girls and boys be 4x and 3x.

4x + 3x = 49

7x = 49

x = 7

So, the number of girls and boys are 28 and 21 respectively.

After 4 girls leave the class, number of girls = 28 - 4 = 24

New ratio of girls to boys = 24:21

= 8:7

The correct option is B.

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