If Owen and Zoe work together on a project, they will complete it in 10 days. If Zoe were to work with Joshua on the same project, they will take a day longer. If Joshua and Bryan work together, they will take 60% more time than Owen and Zoe. If Owen and Bryan were to work together, how many more days will they take to complete the project compared to Zoe and Joshua working together?
Time taken by Owen and Zoe in percent = 100%
Time taken by Joshua and Bryan = 100% + 60% = 160%

Time taken by Owen and Zoe = 10 days ---- (1)
Time taken by Zoe and Joshua = 11 days ---- (2)
Time taken by Joshua and Bryan = 160% x 10 = 16 days ---- (3)

(1) + (2) + (3)
Owen + Zoe + Zoe + Joshua + Joshua + Bryan → 10 + 11 + 16 = 37 days
Owen + 2 (Zoe + Joshua) + Bryan → 37 days
Owen + Bryan + 2 x 11 → 37 days
Owen + Bryan → 37 - 22 = 15 days

More days to complete the project for Owen and Bryan compared to Zoe and Joshua
= 15 - 11
= 4

Answer(s): 4