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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.
Solution
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
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