Jim takes 2 times as long as Rosa to clean the garage. Working together, they can clean the garage in 8 hours. How long does it take Jim and Rosa to clean the garage if they work alone? [For full credit, set up an equation and solve it.]

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.