New Enroll in RBI Grade B New Batch - Starts on May 21

    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

    Practice Next