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

Time taken by Benjamin and Ellie = 10 days ---- (1)
Time taken by Ellie and Avery = 11 days ---- (2)
Time taken by Avery and Claire = 190% x 10 = 19 days ---- (3)

(1) + (2) + (3)
Benjamin + Ellie + Ellie + Avery + Avery + Claire → 10 + 11 + 19 = 40 days
Benjamin + 2 (Ellie + Avery) + Claire → 40 days
Benjamin + Claire + 2 x 11 → 40 days
Benjamin + Claire → 40 - 22 = 18 days

More days to complete the project for Benjamin and Claire compared to Ellie and Avery
= 18 - 11
= 7

Answer(s): 7