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02-05-2017
Mathematics

contestada

The sum of the digits of a certain two-digit number is 7. Reversing its digits decreases the number by 27. Find the original number.

Respuesta :

02-05-2017

X+Y= 7
Y-X= 27
2y=34
Y=17
X=-10
-10+17=7
17--10=27

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