<p>Could someone help clarify this problem for me?
XY + YX = 88</p>
<p>In the addition problem above, X and Y are distinct positive integers. How many different integer values of X are possible? (Answer = 7)</p>
<p>I thought X and Y were being multiplied so I got 2xy = 88 or xy = 44 and found all the factors of 44, but my answer was wrong. This sounds like a really silly/easy question, but I don’t really understand what I’m doing wrong…Thanks!</p>
<p>EDIT: Never mind, it seems like I had the right answer, but the book made a typo.</p>