If Ethan and Lilian work together on a project, they will complete it in 4 days. If Lilian were to work with Violet on the same project, they will take a day longer. If Violet and Evelyn work together, they will take 200% more time than Ethan and Lilian. If Ethan and Evelyn were to work together, how many more days will they take to complete the project compared to Lilian and Violet working together?
Time taken by Ethan and Lilian in percent = 100%
Time taken by Violet and Evelyn = 100% + 200% = 300%

Time taken by Ethan and Lilian = 4 days ---- (1)
Time taken by Lilian and Violet = 5 days ---- (2)
Time taken by Violet and Evelyn = 300% x 4 = 12 days ---- (3)

(1) + (2) + (3)
Ethan + Lilian + Lilian + Violet + Violet + Evelyn → 4 + 5 + 12 = 21 days
Ethan + 2 (Lilian + Violet) + Evelyn → 21 days
Ethan + Evelyn + 2 x 5 → 21 days
Ethan + Evelyn → 21 - 10 = 11 days

More days to complete the project for Ethan and Evelyn compared to Lilian and Violet
= 11 - 5
= 6

Answer(s): 6