Answers

2015-11-13T21:37:02+05:30
let tens digit be x
& units digit be y
x-y=7......................1
10x+y=10(x+y)
10x+y=10x+10y
9y=0
y=0
plug value of y in equation 1
x-y=7
x=7
the number is 7
1 5 1
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