Multiple Choice Questions on The sum of the digits of a 2 digit number is 9 When 27 is added to the number the digits get interch........... for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

The sum of the digits of a 2 digit number is 9 When 27 is added to the number the digits get interch...........

Quantitative Aptitude (RRB NTPC) Number System
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    The sum of the digits of a 2 digit number is 9. When 27 is added to the number, the digits get intercharged. Find the number.

    45

    Incorrect Answer

    36

    Correct Answer

    18

    Incorrect Answer

    27

    Incorrect Answer
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    Explanation:
    x→ tens place, y → unit place
    ⇒ x + y = 9 --------- (1)
    ⇒ 10x+y+27 = 10y+x
    ⇒ 9y–9x = 27
    ⇒ y–x=3 ------------(2)
    (1) + (2)
    ⇒ 2y =12
    y=6
    ∴ The number =36

    By: Barka Mirza
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