If John and Michael work together on a project, they will complete it in 9 days. If Michael were to work with Julie on the same project, they will take a day longer. If Julie and Charlotte work together, they will take 200% more time than John and Michael. If John and Charlotte were to work together, how many more days will they take to complete the project compared to Michael and Julie working together?
Time taken by John and Michael in percent = 100%
Time taken by Julie and Charlotte = 100% + 200% = 300%

Time taken by John and Michael = 9 days ---- (1)
Time taken by Michael and Julie = 10 days ---- (2)
Time taken by Julie and Charlotte = 300% x 9 = 27 days ---- (3)

(1) + (2) + (3)
John + Michael + Michael + Julie + Julie + Charlotte → 9 + 10 + 27 = 46 days
John + 2 (Michael + Julie) + Charlotte → 46 days
John + Charlotte + 2 x 10 → 46 days
John + Charlotte → 46 - 20 = 26 days

More days to complete the project for John and Charlotte compared to Michael and Julie
= 26 - 10
= 16

Answer(s): 16