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Railways Quantitative Aptitude Average Sample Paper Average & Problems on Ages Sample Test Paper-7

  • question_answer
    'The average weight of A, B and C is 84 kg. If D joins the group, the average weight of the group becomes 80 kg. If another man E who weighs 3 kg more than D replaces A, then the average of B, C, D and E becomes 79 kg. What is the weight of A?

    A)  64 kg   

    B)  72 kg

    C)  75 kg   

    D)  80 kg

    Correct Answer: C

    Solution :

    [c] \[A+B+C=3\times 84=252\,\,kg\] \[A+B+C+D=4\times 80=320\,\,kg\] \[\therefore \] \[D=320-252=68\,\,kg\] \[\therefore \] \[E=68+3=71\,\,kg\] Now, \[\frac{320-A+71}{4}=79\] \[\therefore \] \[A=75\,\,kg\]


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