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Railways Sample Paper RRB (Group D) Sample Test Paper-14

  • question_answer
    The average age of boys in the class is twice the number of girls in the class. The ratio of boys and girls in the class of 50 is 4: 1. The total of the ages (in years) of the boys in the class is

    A)  2000               

    B)  2500

    C)  800                 

    D)  400

    Correct Answer: C

    Solution :

    [c] Number of boys\[=\frac{4}{5}\times 50=40\] Number of girls\[=\frac{1}{5}\times 50=10\] Average age of boys=\[2\times 20=40\] Total ages of the boys=\[40\times 20=800\]


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