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If A : B = 2 : 3, B : C = 5 : 7 and C : D = 3 : 10, then what is A : D equal to?

1 : 7
2 : 7
1 : 5
5 : 1

Correct Answer: 1 : 7

Explanation:

Here, A : B = 2 : 3, B : C = 5 : 7 and C : D = 3 : 10
∴ A/D = (A/B) x (B/C) x (C/D)
= (2/3) x (5/7) x (3/10)
= 1/7
∴ A : D = 1 : 7

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