Question

The sum of the two digit number is 12. If the digit are revesed, then the new number is 18 less than the originaol muber that is the number?

Answer 1

A) X + Y = 12

B) 10Y + x = 10x + Y -18

B) 9Y = 9x -18 multiplying A) by -9

A) -9Y = 9x - 72 adding A and B we get

0 = 18x -90

x = 5

The number is 75

Double-Check

7 + 5 = 12

75 -57 = 18

Explanation: