Civil Service Exam Reviewer · Ratio and Proportion · medium
If A : B = 2 : 6 and B : C = 5 : 7, what is A : B : C?
- 2 : 6 : 7
- 2 : 30 : 7
- 10 : 11 : 42
- 5 : 15 : 21
Answer
D. 5 : 15 : 21
Solution
Make B equal: B = LCM(6, 5) = 30. A : B : C = 10 : 30 : 42 = 5 : 15 : 21.
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