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If A : B = 5 : 7 and B : C = 6 : 11, then A : B : C is?

55 : 77 : 66
30 : 42 : 77
35 : 49 : 42
None of these

Correct Answer: 30 : 42 : 77

Explanation:

L.C.M. of 7 and 6 is 42
∴ A : B = 5 : 7 = 30 : 42
and B : C = 6 : 11 = 42 : 77
Hence A : B : C = 30 : 42 : 77

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