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    Question

    A teacher marked a certain average number of papers per

    day for the first 30 days. In the next 10 days, she marked 90 papers daily. This increased her overall average by 5 papers per day. What was the average for the first 30 days?
    A 68 Correct Answer Incorrect Answer
    B 70 Correct Answer Incorrect Answer
    C 72 Correct Answer Incorrect Answer
    D 75 Correct Answer Incorrect Answer

    Solution

    Let, average number of papers marked in first 30 days is x So, (30 ├Ч x + 10 ├Ч 90)/40 = x + 5 Or, 30x + 900 = 40x + 200 Or, 10x = 700 Or, x = 70

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