What is the ratio of number of students enrolled in Singing and Dancing Classes together to those enrolled in Drama Classes respectively?

3 : 1
3 : 5
4 : 7
7 : 5

Correct Answer: 3 : 1

Explanation:

Required ratio = ( % of students enrolled in Singing + % of students enrolled in Dancing classes)/% of students enrolled in Drama Classes
Required ratio = (18 + 21) : 13 = 39 : 13 = 3 : 1

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