If Roshel and Riordan work together on a project, they will complete it in 5 days. If Riordan were to work with Salik on the same project, they will take a day longer. If Salik and Anna work together, they will take 160% more time than Roshel and Riordan. If Roshel and Anna were to work together, how many more days will they take to complete the project compared to Riordan and Salik working together?
Time taken by Roshel and Riordan in percent = 100%
Time taken by Salik and Anna = 100% + 160% = 260%

Time taken by Roshel and Riordan = 5 days ---- (1)
Time taken by Riordan and Salik = 6 days ---- (2)
Time taken by Salik and Anna = 260% x 5 = 13 days ---- (3)

(1) + (2) + (3)
Roshel + Riordan + Riordan + Salik + Salik + Anna → 5 + 6 + 13 = 24 days
Roshel + 2 (Riordan + Salik) + Anna → 24 days
Roshel + Anna + 2 x 6 → 24 days
Roshel + Anna → 24 - 12 = 12 days

More days to complete the project for Roshel and Anna compared to Riordan and Salik
= 12 - 6
= 6

Answer(s): 6