Question

    A student scored an average of 81 marks in his first 30

    tests. In the next 10 tests, his average score was ‘x’ marks, and his overall average rose to 84 marks. Find the value of 'x'.
    A 93 Correct Answer Incorrect Answer
    B 87 Correct Answer Incorrect Answer
    C 69 Correct Answer Incorrect Answer
    D 77 Correct Answer Incorrect Answer

    Solution

    ATQ,

    {81 × 30 + 10 × x}/(30 + 10) = 84

    Or, 10x + 2430 = 84 × 40 = 3360

    Or, 10x = 930

    Or, x = 93

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