Multiple Choice Questions on If a b 2 3 and b c 5 7 find the value of a b c ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

If a b 2 3 and b c 5 7 find the value of a b c ........

Quant (SSC) Ratio, Proportion
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    If a : b = 2 : 3 and b : c = 5 : 7, find the value of  a : b : c ?

    5 : 7 : 13
    Incorrect Answer
    10 : 15 : 17
    Incorrect Answer
    10 : 15 : 21
    Correct Answer
    7 : 15 : 13
    Incorrect Answer
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    Explanation:

    Given a/b = 2:3 and b/c 5:7
    ∴  a/c = (a/b x b/c)
    = (2/3 x 5/7) = 10/21
    So, a : c = 10 : 21
    Also, a : b = 2 : 3 and b : c = 5 : 7
    = 3/5 x 5 : 3/5 x 7 = 3 : 21/5
    ∴   a : b : c = 2 : 3 : 21/5
    = 10 : 15 : 21.

    By: Amit Kumar
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