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

    Question

    A number when divided by 21 gives a remainder of 15.

    What will be the remainder when twice that number is divided by 21?
    A 13 Correct Answer Incorrect Answer
    B 23 Correct Answer Incorrect Answer
    C 17 Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Number = (21A + 15), where 'A' is a constant.

    Therefore, required remainder = [2 × (21A + 15)] ÷ 21

    = (42A + 30) ÷ 21

    = (42A + 21 + 9) ÷ 21 = 9

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