Ratio & Proportion · Question 27 · Hard
If A : B = 2 : 3, B : C = 5 : 7 and C : D = 3 : 4, what is A : D?
- 4 : 7
- 10 : 21
- 5 : 14
- 15 : 28
Answer and explanation
Answer: C. 5 : 14
Explanation: A/D = (A/B)(B/C)(C/D) = (2/3)(5/7)(3/4) = 30/84 = 5/14. So A : D = 5 : 14.
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