If A : B = 2 : 3, B : C = 4 : 5 and C : D = 6 : 7, what is the ratio between A to D ?

If A : B = 2 : 3, B : C = 4 : 5 and C : D = 6 : 7, what is the ratio between A to D ? Correct Answer 16 : 35

A : B = 2 : 3 = (2 x 8) : (3 x 8) = 16 : 24 B : C = 4 : 5 = (4 x 6) : (5 x 6) = 24 : 30 C : D = 6 : 7 = (6 x 5) : (7 x 5) = 30 : 35 So, A : B : C : D = 16 : 24 : 30 : 35 Therefore,  A : D =  16 : 35
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