. A number consists of two digits of which ten's
digit exceeds the unit digit by 7. The number
itself is equal to 10 times the sum of its digits.
Find the number.
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Answer:
let the unit digit be x
so tens is x+7
the number is 10(x+7)+x
=10x+7+x
=11x+7
sum of digit is x+x+7
=2x+7
10(2x+7)=11x+7
20x+70=11x+7
9x=63
x=7
the number is ?????????????
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