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  1. In a class average age of 15 boys is 11. If 5 boys each of age 9 years are added, what would be the new average?

    2. A.
    20 years
    B.
    10 years
    C.
    10.5 years
    D.
    23 years

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    Answer : Option c

    Explanation :


    Sum of ages of 15 boys = 15*11=165
    Sum of ages of 5 boys = 5*9 =45
    Total age of 20 boys = 165+45 = 210
    Average of ages of 20 boys = 210/20= 10.5 years

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