Multiple Choice Questions on If 3x 4y 12z then z is equal to ........ for CDS Exam Preparation

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Multiple Choice Questions

If 3x 4y 12z then z is equal to ........

Quantitative Aptitude (CDS) Simplification
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    If 3x = 4y = 12z, then z is equal to

    xy

    Incorrect Answer

    x + y

    Incorrect Answer

    xy / x+y

    Correct Answer

    4x+3y

    Incorrect Answer
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    Explanation:

    3x = 4y = 12z
    Taking log of all 3 we get
    x log3 = ylog4 = zlog12 = k
    z = k/log12 = k / log(3*4) = k/log3 + log4 = k / (k/x +k/y) = xy / (x+y)

    By: Munesh Kumari
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