If Michael and Lilian work together on a project, they will complete it in 5 days. If Lilian were to work with Henry on the same project, they will take a day longer. If Henry and Roshel work together, they will take 100% more time than Michael and Lilian. If Michael and Roshel were to work together, how many more days will they take to complete the project compared to Lilian and Henry working together?
Time taken by Michael and Lilian in percent = 100%
Time taken by Henry and Roshel = 100% + 100% = 200%

Time taken by Michael and Lilian = 5 days ---- (1)
Time taken by Lilian and Henry = 6 days ---- (2)
Time taken by Henry and Roshel = 200% x 5 = 10 days ---- (3)

(1) + (2) + (3)
Michael + Lilian + Lilian + Henry + Henry + Roshel → 5 + 6 + 10 = 21 days
Michael + 2 (Lilian + Henry) + Roshel → 21 days
Michael + Roshel + 2 x 6 → 21 days
Michael + Roshel → 21 - 12 = 9 days

More days to complete the project for Michael and Roshel compared to Lilian and Henry
= 9 - 6
= 3

Answer(s): 3