Question 519522
let the number be written as xy

x-ten's place
y units place

x+y=11.....................1

(10x+y)-(10y+x)=9
10x+y-10y-x=9
9x-9y=9
/9
x-y=1......................2

Add (1) & (2)

2x=12
x=6
y=5
the number is 65

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