ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!

    Question

    A two-digit number has a digit-sum of 9. Subtracting 27

    from it gives the number with digits reversed. What is the number?
    A 63 Correct Answer Incorrect Answer
    B 56 Correct Answer Incorrect Answer
    C 73 Correct Answer Incorrect Answer
    D 65 Correct Answer Incorrect Answer

    Solution

    ATQ,
    a + b = 9 --------- (I)

    10b + a - 27 = 10a + b
    тЗТ 9b - 9a = 27

    тЗТ b - a = 3 --------- (II)

    Add both:

    a + b + b - a = 9 + 3

    тЗТ 2b = 12 тЗТ b = 6

    Then a = 3

    Required number = 10 ├Ч 6 + 3 = 63

    Practice Next
    More No. System Questions

    Relevant for Exams:

    ask-question