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  5. Ratio and Proportion

Railways Quantitative Aptitude Ratio and Proportion Sample Paper Ratio, Proportion & Partnership Sample Test Paper-6

  • question_answer
    The ratio of three numbers is 3 : 4 : 5 and sum of their squares is 1250. The sum of the numbers is

    A)  30                   

    B)  50      

    C)  60                   

    D)  90

    Correct Answer: C

    Solution :

    [c] Let numbers be 3x, 4x, 5x \[\therefore \] \[{{(3x)}^{2}}+{{(4x)}^{2}}+{{(5x)}^{2}}=1250\] \[9{{x}^{2}}+16{{x}^{2}}+25{{x}^{2}}=1250\] \[50{{x}^{2}}=1250\] \[{{x}^{2}}=25\] x = 5 \[\therefore \,\] Numbers are = 15, 20, 25 Sum = 15 + 20 + 25 = 60


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