One of the two digit of a two digit is four times the other digit. If you interchange the digits of this two digit number and add the resulting number to the orginal number, you get 110. What is the orignal number?
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x+4x=5x
..
x+4x+5x=110
10x=110
x=110/10
=11
..
x+4x+5x=110
10x=110
x=110/10
=11
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