The unit digit of a two- digit number is 3 and seven times the sum of the digits is the number itself. Find the number.
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Number =y×10+x
Given x=3
7(x+y)=10y+x...(1)
7(3+y)=10y+3
21+7y=10y+3
−3y=−18
y=6
Number =63
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