You can put this solution on YOUR website!
Let's let the first digit be A and the second digit be B.
The number can be represented as,
You also know that
When you interchange the digits, the new number becomes,
And then you also know that
Plug the value for B from eq. 1 into eq. 2 and solve for A.
From eq. 1,
The original number is 26, the interchange number is 62.
As a check, add them together to get 88.