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

    Question

    Out of 6 numbers, the average of first 5 is 19 and last

    5 is 20. If the last number is 21. Find the first number?
    A 18 Correct Answer Incorrect Answer
    B 9 Correct Answer Incorrect Answer
    C 13 Correct Answer Incorrect Answer
    D 16 Correct Answer Incorrect Answer

    Solution

    Sum of first five numbers = 19 × 5 = 95 Given that last number = 21 Sum of all the six numbers = 95 + 21 = 116 .....(i) Sum of last 5 digits = 20 × 5 = 100 …...(ii) By subtracting (ii) from (i), we will get the first number, the first number, First number = (i) – (ii) = 116 – 100 = 16

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