math

the sum of the digits of a two digit number is 9. if the digits are reversed, the new number if 63 grater than the original number. what is the original number?

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  1. The number is AB
    A+B=9
    10B+A=63+10A+B

    Those two equations will solve it.

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    bobpursley
  2. 7,2 ---> 2,7
    5,4 ----> 4,5
    1,8 ----->8,1
    9,0 -----> can't be reversed because it doesn't become a two digit number.
    3,6 ----->6,3
    -----------------------------------
    all these two digit numbers add up to 9, and if reversed, you should subtract
    72- 27= does it equal greater than 63, no
    54-45= ..........................., no
    81-18 = yes it does ===63

    so the original number is 18

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