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March 25, 2017

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If the tens digit of a two-digit number is subtracted from the units digit, the difference is 8. The number with the digits reversed is 10 more than nine times the units digit of the original number. Find the number.

  • ALgebra...plz help - ,

    Let the two digit number be 10A + B.

    Then, from "If the tens digit of a two-digit number is subtracted from the units digit, the difference is 8.", or
    B - A = 8.

    From "The number with the digits reversed is 10 more than nine times the units digit of the original number.", 10B + A = 9B + 10.

    Substituting A = B - 8 into 10B + A = 9B + 10 yields 10B + B - 8 = 9B + 10 or 11B - 8 = 9B + 10 or 2B = 18 making B = 9.

    From B - A = 8, 9 - A = 8 making A = 1 or the number = 19.

  • ALgebra...plz help - ,

    too easy

  • ALgebra...plz help - ,

    Let unit digit = x
    Then tens did it = 8+x
    Original no.is 10(8+x)+x
    80+10x+x=80+11x
    On reversing : 10x+8+x =11x+8
    11x+8=10+9x
    11x-9x=10-8
    2x=2
    X=1
    No.is 80+11x=80+11=91

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