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

  • question_answer
    The average of some natural numbers is 15. If 30 is added to first number and 5 is subtracted from the last number the average becomes 17.5 then the number of natural number is:

    A)  20                   

    B)              30

    C)  15                   

    D)              10

    Correct Answer: D

    Solution :

    [d] Let number of natural numbers be x \[\therefore \,\,\,15x+30-\,5=17.5x\] \[25=2.5x\] \[x=\frac{25}{2.5}\times 10\] So 10 natural numbers are there.


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