If Dylan and Rebecca work together on a project, they will complete it in 12 days. If Rebecca were to work with Bryan on the same project, they will take a day longer. If Bryan and Charlotte work together, they will take 100% more time than Dylan and Rebecca. If Dylan and Charlotte were to work together, how many more days will they take to complete the project compared to Rebecca and Bryan working together?
Time taken by Dylan and Rebecca in percent = 100%
Time taken by Bryan and Charlotte = 100% + 100% = 200%

Time taken by Dylan and Rebecca = 12 days ---- (1)
Time taken by Rebecca and Bryan = 13 days ---- (2)
Time taken by Bryan and Charlotte = 200% x 12 = 24 days ---- (3)

(1) + (2) + (3)
Dylan + Rebecca + Rebecca + Bryan + Bryan + Charlotte → 12 + 13 + 24 = 49 days
Dylan + 2 (Rebecca + Bryan) + Charlotte → 49 days
Dylan + Charlotte + 2 x 13 → 49 days
Dylan + Charlotte → 49 - 26 = 23 days

More days to complete the project for Dylan and Charlotte compared to Rebecca and Bryan
= 23 - 13
= 10

Answer(s): 10