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

    Question

    Average 20 numbers is ‘x’. If the average of first

    12 numbers is 62.5 while average of last 5 numbers is 84.8 and 13th, 14th and 15th numbers are (2x - 49), (x + 52) and 183 respectively. Find the 14th number.
    A 132 Correct Answer Incorrect Answer
    B 147.5 Correct Answer Incorrect Answer
    C 138.5 Correct Answer Incorrect Answer
    D 142 Correct Answer Incorrect Answer

    Solution

    According to question, => 20x = 62.5 × 12 + 84.8 × 5 + 2x – 49 + x + 52 + 183 => 17x = 1360 => x = 80 Therefore, 14th number = 80 + 52 = 132

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