b) In a school, there are a total of 6300 classrooms. The ratio of the number of large
classrooms to small classrooms is 1 : 5. Find the number of large classrooms and
small classrooms in the school.
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Answer:
Let the number of large classrooms = 3x
Number of small classrooms = 4x
Given that number of small classrooms = 20
⟹4x=20⟹x=
4
20
=
4÷4
20÷4
=5
∴x=5
Number of large classrooms = 3×5=15
Explanation:
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