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March 29, 2017

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The units digit of a 2 digit number exceeds thrice the tens digit by 1. The sum of the digits is 9. Find the number.

  • number problem - ,

    27

  • number problem - ,

    a = first number

    b = second number


    b = 3 a + 1


    a + b = 9

    a + 3 a + 1 = 9

    4 a + 1 = 9 Subtract 1 to both sides

    4 a + 1 - 1 = 9 - 1

    4 a = 8 Divide both sides by 4

    a = 8 / 4

    a = 2


    b = 3 a + 1

    b = 3 * 2 + 1

    b = 6 + 1

    b = 7


    Your number :

    27

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