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

Time taken by Ryan and Maya = 10 days ---- (1)
Time taken by Maya and Jack = 11 days ---- (2)
Time taken by Jack and Jamie = 190% x 10 = 19 days ---- (3)

(1) + (2) + (3)
Ryan + Maya + Maya + Jack + Jack + Jamie → 10 + 11 + 19 = 40 days
Ryan + 2 (Maya + Jack) + Jamie → 40 days
Ryan + Jamie + 2 x 11 → 40 days
Ryan + Jamie → 40 - 22 = 18 days

More days to complete the project for Ryan and Jamie compared to Maya and Jack
= 18 - 11
= 7

Answer(s): 7