>An example: > >You can use more than one "work" column to get to the result. > >. Known Work Work Result >--------------------------------- >| 16 | 48 | 24 | 12 | >|-------------------------------- >| 28 | 84 | 42 | X | >--------------------------------- > >First row logic: > >(((16 * 3) / 2) / 2) = 12 (there are other solutions other than * 3 / 2 / 2) >((48 / 2) / 2) = 12 >24 / 2 = 12 > > >Use same logic on second row: > >(((28 * 3) / 2) / 2 = X >((84 / 2) / 2) = X >42 / 2 = X >21 = X > > >The one I can't solve without fractions or decimals. > >This is how the table looks (could be more than one "work" column though). > >. Known Work Result >------------------------- >| 50 | | 18 | >|------------------------ >| 60 | | X | >------------------------- >OK, I think I see what you're doing. In your first (solved) example, each column is the ratio of 4/7 (top/bottom). This holds true for both the intermediate, "work" columns. As I see it you can have as many work columns as you want, and their ratios top/bottom should all be 4/7. So, in the first example X = 12 * ( 7 / 4 ) = 21.