If Alexander and Levi work together on a project, they will complete it in 7 days. If Levi were to work with Michael on the same project, they will take a day longer. If Michael and Ethan work together, they will take 200% more time than Alexander and Levi. If Alexander and Ethan were to work together, how many more days will they take to complete the project compared to Levi and Michael working together?
Time taken by Alexander and Levi in percent = 100%
Time taken by Michael and Ethan = 100% + 200% = 300%

Time taken by Alexander and Levi = 7 days ---- (1)
Time taken by Levi and Michael = 8 days ---- (2)
Time taken by Michael and Ethan = 300% x 7 = 21 days ---- (3)

(1) + (2) + (3)
Alexander + Levi + Levi + Michael + Michael + Ethan → 7 + 8 + 21 = 36 days
Alexander + 2 (Levi + Michael) + Ethan → 36 days
Alexander + Ethan + 2 x 8 → 36 days
Alexander + Ethan → 36 - 16 = 20 days

More days to complete the project for Alexander and Ethan compared to Levi and Michael
= 20 - 8
= 12

Answer(s): 12