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SSC Quantitative Aptitude Average Question Bank Average (II)

  • question_answer
    In an examination average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the same class is 87. If the girls and boys are in the ratio 4 : 5, average marks of the whole class (approx.) is closest to [SSC CGL Tier II, 2015]

    A) 86.4

    B) 86.1

    C) 86.5

    D) 85.9

    Correct Answer: B

    Solution :

    [b] Let the number of girls and boys in the class are 4x and 5x, respectively. Then, Average marks of whole class \[=\frac{85\times 4x+87\times 5x}{4x+5x}\]             \[=\frac{340x+435x}{9x}=\frac{775x}{9x}=86.1\]


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