Traci mixed nuts and raisins together in bags to make a trail mix. She had a total of 6 cups of nuts and 8 cups of raisins. She placed 3 cup of nuts in each bag, and 4 cup of raisins in each bag. Traci wanted each bag to have a mixture of nuts and raisins. After Traci uses all the nuts she has, how many more bags need nuts added?