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SSC Sample Paper SSC-CGL TIER - I Sample Test Paper-3

  • question_answer
    In a class of 45 students, the ratio of boys and girls is 5: 4. The average marks obtained by boys in a maths test of 100 marks is 76 and the average marks received by girls is 78. What is the average marks obtained by the whole class? (up to two places of decimals)

    A) 76.89           

    B) 77

    C) 77.29           

    D) 75.98

    Correct Answer: A

    Solution :

    Boys = \[\frac{5}{9}\times 45=25\]and girls 45 ? 25 = 20 \[\therefore \]      Required average =         \[\frac{25\times 76+20\times 78}{45}=\frac{3460}{45}\] =         [76.89 (approx)]


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