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If A : B = 2 : 3, B : C = 4 : 5 and C : D = 6 : 7, then A : D is equal to?

2 : 7
7 : 8
16 : 35
4 : 13

Correct Answer: 16 : 35

Explanation:

∵ A/D = (A/B) x (B/C) x (C/D) = (2/3) x (4/5) x (6/7) = 16/35
∴ A : D = 16 : 35

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