If Julie and Roshel work together on a project, they will complete it in 6 days. If Roshel were to work with Riordan on the same project, they will take a day longer. If Riordan and Owen work together, they will take 100% more time than Julie and Roshel. If Julie and Owen were to work together, how many more days will they take to complete the project compared to Roshel and Riordan working together?
Time taken by Julie and Roshel in percent = 100%
Time taken by Riordan and Owen = 100% + 100% = 200%

Time taken by Julie and Roshel = 6 days ---- (1)
Time taken by Roshel and Riordan = 7 days ---- (2)
Time taken by Riordan and Owen = 200% x 6 = 12 days ---- (3)

(1) + (2) + (3)
Julie + Roshel + Roshel + Riordan + Riordan + Owen → 6 + 7 + 12 = 25 days
Julie + 2 (Roshel + Riordan) + Owen → 25 days
Julie + Owen + 2 x 7 → 25 days
Julie + Owen → 25 - 14 = 11 days

More days to complete the project for Julie and Owen compared to Roshel and Riordan
= 11 - 7
= 4

Answer(s): 4