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    Question

    The average of twenty numbers is 40 while the average of

    first ten numbers and last ten numbers is 48 and 56, respectively. Find the tenth term.
    A 200 Correct Answer Incorrect Answer
    B 120 Correct Answer Incorrect Answer
    C 240 Correct Answer Incorrect Answer
    D 285 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Sum of twenty numbers = (20 × 40) = 800

    Sum of the first ten numbers = (10 × 48) = 480

    Sum of the last ten numbers = (10 × 56) = 560

    So, tenth term = 480 + 560 - 800 = 240

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