Question 380469

You have not set up another equation
let the number be x y
x+y= 13.....................1
10y+x = 10x+y-27 
10y-y+x-10x=-27
9y-9x==-27
/9
y-x=-3......................2
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add 1 & 2
2y= 13-3
2y=10
/2
y=5
..
x+y = 13
so x=8
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The number is 85
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m.ananth@hotmail.ca