Ashley uses 1/4 package of raisin for a fruit cake. she then uses 1/9 of the remainder for muffins. what fraction of the package of raisins dose she have left?

Find a common denominator between 1/4 and 1/9. The common denominator is 36. Multiply 1/4, 1 and 4, by 9. You get 9/36. Multiply 1/9, 1 and 9, by 4. You get 4/36. Add the two answers together. 
9/36 + 4/36 = 13/36
Now subtract 36 by 13 to get 23. You get 23/36. This is the most simplified form.
Ashley has 23/36 package of raisin left.

The answer is option c.