Civil Service Exam Reviewer · Ratio and Proportion · medium

If A : B = 3 : 7 and B : C = 6 : 2, what is A : B : C?

1. 9 : 21 : 7
2. 3 : 7 : 2
3. 3 : 42 : 2
4. 18 : 13 : 14

Answer

A. 9 : 21 : 7

Solution

Make B equal: B = LCM(7, 6) = 42. A : B : C = 18 : 42 : 14 = 9 : 21 : 7.

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