Question

In a school, the ratio of the number of large classrooms to small classrooms is 3 : 4. If the number of small rooms is 20, then find the number of large rooms.

Answer 1

Let the number of large classrooms be 3x and the number of small classrooms be 4x.

We have given, the number of small rooms = 20

4x = 20

x = 20/4

x = 5

∴ The number of large classrooms is 3 × 5 = 15