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

Given, ratio of number of large classrooms to small classrooms = 3:4

Number of small classrooms = 20

Let the classrooms are multiple of x.

So, large classrooms = 3x

Small classrooms = 4x

 4x = 20

⇒ x = `20/4` = 5 

Hence, number of large classrooms = 3x

= 3 × 5

= 15