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Question

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

A
55 : 77 : 66
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B
30 : 42 : 77
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C
35 : 49 : 42
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D
None of these
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Solution

The correct option is B 30 : 42 : 77
A:B=5:7,B:C=6:11,
ab=57 and bc=611
a=57b and c=116b,
Taking b=6×7=42, we get
a=5×6=30,c=11×7=77
Hence, A:B:C=30:42:77

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