Multiple Choice Questions on The number that must be added to each of the number 8 21 13 and 31 to make the ratio of the first tw........... for CDS Exam Preparation

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Multiple Choice Questions

The number that must be added to each of the number 8 21 13 and 31 to make the ratio of the first tw...........

Quantitative Aptitude (CDS) Ratio, Proportion
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    The number that must be added to each of the number 8,21,13 and 31 to make the ratio of the first two numbers equal to the ratio of the last two number is?

     

     3
     

    Incorrect Answer

    8
     

    Incorrect Answer

    5
     

    Correct Answer

    7

    Incorrect Answer
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    Explanation:

    Let x be added to these numbers 
    8+x/21+x  =13+x/31+x
    (8+x)(31+x)=(21+x)(13+x)
    248+8x+31x+x2=273+13x+21x+x2
    5x=25
    x=5

    By: bhavesh kumar singh
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