If Leah and Oliver work together on a project, they will complete it in 12 days. If Oliver were to work with Elijah on the same project, they will take a day longer. If Elijah and Ethan work together, they will take 50% more time than Leah and Oliver. If Leah and Ethan were to work together, how many more days will they take to complete the project compared to Oliver and Elijah working together?
Time taken by Leah and Oliver in percent = 100%
Time taken by Elijah and Ethan = 100% + 50% = 150%

Time taken by Leah and Oliver = 12 days ---- (1)
Time taken by Oliver and Elijah = 13 days ---- (2)
Time taken by Elijah and Ethan = 150% x 12 = 18 days ---- (3)

(1) + (2) + (3)
Leah + Oliver + Oliver + Elijah + Elijah + Ethan → 12 + 13 + 18 = 43 days
Leah + 2 (Oliver + Elijah) + Ethan → 43 days
Leah + Ethan + 2 x 13 → 43 days
Leah + Ethan → 43 - 26 = 17 days

More days to complete the project for Leah and Ethan compared to Oliver and Elijah
= 17 - 13
= 4

Answer(s): 4