If Ella and Josiah work together on a project, they will complete it in 10 days. If Josiah were to work with Roshel on the same project, they will take a day longer. If Roshel and Elizabeth work together, they will take 170% more time than Ella and Josiah. If Ella and Elizabeth were to work together, how many more days will they take to complete the project compared to Josiah and Roshel working together?
Time taken by Ella and Josiah in percent = 100%
Time taken by Roshel and Elizabeth = 100% + 170% = 270%

Time taken by Ella and Josiah = 10 days ---- (1)
Time taken by Josiah and Roshel = 11 days ---- (2)
Time taken by Roshel and Elizabeth = 270% x 10 = 27 days ---- (3)

(1) + (2) + (3)
Ella + Josiah + Josiah + Roshel + Roshel + Elizabeth → 10 + 11 + 27 = 48 days
Ella + 2 (Josiah + Roshel) + Elizabeth → 48 days
Ella + Elizabeth + 2 x 11 → 48 days
Ella + Elizabeth → 48 - 22 = 26 days

More days to complete the project for Ella and Elizabeth compared to Josiah and Roshel
= 26 - 11
= 15

Answer(s): 15