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

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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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