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Railways Sample Paper RRB (Group D) Sample Test Paper-13

  • question_answer
    In a motor of 120 machine parts, 5% parts were defective. In another motor of 80 machine parts, 10% parts were defective. For the two motors considered together, the percentage of defective machine parts were

    A)  7        

    B)  6.5

    C)  7.5                  

    D)  8

    Correct Answer: A

    Solution :

    [a] Total deffective part\[=\frac{5}{100}\times 120+\frac{10}{100}\times 80\] \[=6+8=14\] Deffective % = \[\frac{14}{200}\times 100=7%\]


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