Civil Service Exam Reviewer · Ratio and Proportion · medium
If A : B = 5 : 3 and B : C = 7 : 5, what is A : B : C?
- 5 : 3 : 5
- 5 : 21 : 5
- 35 : 10 : 15
- 35 : 21 : 15
Answer
D. 35 : 21 : 15
Solution
Make B equal: B = LCM(3, 7) = 21. A : B : C = 35 : 21 : 15 = 35 : 21 : 15.
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