Question 352563
let ten's digit be x
and unit's digit be y
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the number = 10x+y
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y=3x-1
y-3x=-1...................1
x+y =11..................2
multiply equation1 by -1 and add to 2
-y+3x=1
x+y=11
4x= 12
x=3
x+y=11
so y =8
the number is 38

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m.ananth@hotmail.ca