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If a:b=1:3, b:c=5:7 then what is the value of a:b:c?

If a:b=1:3, b:c=5:7 then what is the value of a:b:c? Correct Answer 5:15:21

a:b = 1:3 *5 = 5:15b:c = 5:7 *3 = 15:21So, a:b:c = 5:15:21 (Ans)

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