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What three digits are represented by X, Y, and Z in this addition problem?
XZY
+XYZ
______
YZX
Here is the solution!
What was the problem?
Here is the equation rewritten.
XZY
+XYZ
______
YZX
Let's start with the tens place. Z + Y = Z is there. That means either Y = 0 or 9 if 1 is carry from ones place.
Since Y is at hundred's place it can't be 0. Hence, Y = 9.
At hundred's column, now we have, X + X = 9. That's only possible if X = 4 and carry 1 forwarded from tens place. So X = 4.
Now, finally, at ones place, we have, 9 + Z = 4. Hence, Z must be 5 with carry 1 being forwarded to the next place.
To sum up, X = 4, Y = 9 and Z = 5.