If Oliver and Evelyn work together on a project, they will complete it in 10 days. If Evelyn were to work with Avery on the same project, they will take a day longer. If Avery and Jacob work together, they will take 90% more time than Oliver and Evelyn. If Oliver and Jacob were to work together, how many more days will they take to complete the project compared to Evelyn and Avery working together?
Time taken by Oliver and Evelyn in percent = 100%
Time taken by Avery and Jacob = 100% + 90% = 190%

Time taken by Oliver and Evelyn = 10 days ---- (1)
Time taken by Evelyn and Avery = 11 days ---- (2)
Time taken by Avery and Jacob = 190% x 10 = 19 days ---- (3)

(1) + (2) + (3)
Oliver + Evelyn + Evelyn + Avery + Avery + Jacob → 10 + 11 + 19 = 40 days
Oliver + 2 (Evelyn + Avery) + Jacob → 40 days
Oliver + Jacob + 2 x 11 → 40 days
Oliver + Jacob → 40 - 22 = 18 days

More days to complete the project for Oliver and Jacob compared to Evelyn and Avery
= 18 - 11
= 7

Answer(s): 7