Question 896962
94 - 49 = 45.  The number you're looking for is 49.
Guesstimated.  I know there are all sorts of <a href=http://wildaboutmath.com/2008/02/01/math-magic-with-the-number-9/>Nine Tricks</a> in math, so added the 4&5 and then subtracted from 13.<br>
If you need the full steps and not just the answer, please repost.