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If A : B = 7 : 9 and B : C = 3 : 5 then A : B : C is?

7 : 9 : 5
21 : 35 : 45
7 : 9 : 15
7 : 3 : 15

Correct Answer: 7 : 9 : 15

Explanation:

A : B = 7
and B : C = 3 : 5 = 9 : 15
∴ A : B : C = 7 : 9 : 15

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