If Isaac and Aria work together on a project, they will complete it in 5 days. If Aria were to work with Oliver on the same project, they will take a day longer. If Oliver and Ethan work together, they will take 80% more time than Isaac and Aria. If Isaac and Ethan were to work together, how many more days will they take to complete the project compared to Aria and Oliver working together?
Time taken by Isaac and Aria in percent = 100%
Time taken by Oliver and Ethan = 100% + 80% = 180%

Time taken by Isaac and Aria = 5 days ---- (1)
Time taken by Aria and Oliver = 6 days ---- (2)
Time taken by Oliver and Ethan = 180% x 5 = 9 days ---- (3)

(1) + (2) + (3)
Isaac + Aria + Aria + Oliver + Oliver + Ethan → 5 + 6 + 9 = 20 days
Isaac + 2 (Aria + Oliver) + Ethan → 20 days
Isaac + Ethan + 2 x 6 → 20 days
Isaac + Ethan → 20 - 12 = 8 days

More days to complete the project for Isaac and Ethan compared to Aria and Oliver
= 8 - 6
= 2

Answer(s): 2