If Julie and Lucy work together on a project, they will complete it in 10 days. If Lucy were to work with Aria on the same project, they will take a day longer. If Aria and Andrew work together, they will take 80% more time than Julie and Lucy. If Julie and Andrew were to work together, how many more days will they take to complete the project compared to Lucy and Aria working together?
Time taken by Julie and Lucy in percent = 100%
Time taken by Aria and Andrew = 100% + 80% = 180%

Time taken by Julie and Lucy = 10 days ---- (1)
Time taken by Lucy and Aria = 11 days ---- (2)
Time taken by Aria and Andrew = 180% x 10 = 18 days ---- (3)

(1) + (2) + (3)
Julie + Lucy + Lucy + Aria + Aria + Andrew → 10 + 11 + 18 = 39 days
Julie + 2 (Lucy + Aria) + Andrew → 39 days
Julie + Andrew + 2 x 11 → 39 days
Julie + Andrew → 39 - 22 = 17 days

More days to complete the project for Julie and Andrew compared to Lucy and Aria
= 17 - 11
= 6

Answer(s): 6