If Riordan and Michael work together on a project, they will complete it in 9 days. If Michael were to work with Lily on the same project, they will take a day longer. If Lily and Wyatt work together, they will take 100% more time than Riordan and Michael. If Riordan and Wyatt were to work together, how many more days will they take to complete the project compared to Michael and Lily working together?
Time taken by Riordan and Michael in percent = 100%
Time taken by Lily and Wyatt = 100% + 100% = 200%

Time taken by Riordan and Michael = 9 days ---- (1)
Time taken by Michael and Lily = 10 days ---- (2)
Time taken by Lily and Wyatt = 200% x 9 = 18 days ---- (3)

(1) + (2) + (3)
Riordan + Michael + Michael + Lily + Lily + Wyatt → 9 + 10 + 18 = 37 days
Riordan + 2 (Michael + Lily) + Wyatt → 37 days
Riordan + Wyatt + 2 x 10 → 37 days
Riordan + Wyatt → 37 - 20 = 17 days

More days to complete the project for Riordan and Wyatt compared to Michael and Lily
= 17 - 10
= 7

Answer(s): 7