Multiple Choice Questions on If log x y log5 1 2 logx 1 2logy 0 then find the value of x y y x ........ for NDA Exam Preparation

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Multiple Choice Questions

If log x y log5 1 2 logx 1 2logy 0 then find the value of x y y x ........

Mathematics (NDA) Logarithm
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    If log(x-y)-log5 -1/2 logx  -1/2logy  =0 ,then find the value of x/y +y/x ?

    18

    Incorrect Answer

    21

    Incorrect Answer

    27

    Correct Answer

    30

    Incorrect Answer
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    Explanation:

    log(x-y)-log5 -1/2 logx  -1/2logy  =0

    log(x-y)-1/2  logxy =log5

    2log(x-y)-logxy  =2log5

    Log(x-y)2 /xy  =log25

    (X2 +y2 -2xy)/xy =25

    x/y  +y/x  -2  =25

    x/y +y/x   =27

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