Multiple Choice Questions on The average age of a class is 19 years While the average age of boys is 20 and the average age of gi........... for Combined Bank PO and Clerical Exams Preparation

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Multiple Choice Questions

The average age of a class is 19 years While the average age of boys is 20 and the average age of gi...........

Quantitative Aptitude(Banking) Average
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    The average age of a class is 19 years. While the average age of boys is 20 and the average age of girls is 17. If the number of boys is 20 then find the number of girls in the class?

    10

    Correct Answer

    15

    Incorrect Answer

    16

    Incorrect Answer

    18

    Incorrect Answer
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    Explanation:

    Average of class = 19 = Sum/(b+g)
    sum (girls) = g*17
    sum (boys) = b*20
    19b + 19g = 17g + 20b
    2g = b = 20. So girls = 10

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