scale the division so you can work with integers. For example make it
20 / 5 wich is 4 then add 30 so the result will be 34. If you print the value on a display you can just add a decimal point beween the 3 and 4.
Pic's aren't very good at math, specially floating point.
For code snippets about multiplying and dividing go to the pic list www.piclist.com