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

    Question

    The average of 8 numbers is 12. If the 2 is added in 1st

    number, 4 is added in 2nd number, 8 is added in 3rd number and in the same way the number are added in each number. Find the new average?
    A 75.75 Correct Answer Incorrect Answer
    B 85.75 Correct Answer Incorrect Answer
    C 75.25 Correct Answer Incorrect Answer
    D 85.25 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Average of 8 numbers = 12 Sum of 8 numbers = 12 × 8 = 96 Now the sum of numbers added, 2, 4, 8, 16 …….. 8 terms Sum of 12 terms S₁₂ = a`xx` (rn-1))/(r-1) = 2 `xx` (28-1))/(2-1) = 2×255 = 510 New average = (96+510)/8 = 75.75

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