If Dylan and Zoe work together on a project, they will complete it in 10 days. If Zoe were to work with Jonathan on the same project, they will take a day longer. If Jonathan and Ella work together, they will take 110% more time than Dylan and Zoe. If Dylan and Ella were to work together, how many more days will they take to complete the project compared to Zoe and Jonathan working together?
Time taken by Dylan and Zoe in percent = 100%
Time taken by Jonathan and Ella = 100% + 110% = 210%

Time taken by Dylan and Zoe = 10 days ---- (1)
Time taken by Zoe and Jonathan = 11 days ---- (2)
Time taken by Jonathan and Ella = 210% x 10 = 21 days ---- (3)

(1) + (2) + (3)
Dylan + Zoe + Zoe + Jonathan + Jonathan + Ella → 10 + 11 + 21 = 42 days
Dylan + 2 (Zoe + Jonathan) + Ella → 42 days
Dylan + Ella + 2 x 11 → 42 days
Dylan + Ella → 42 - 22 = 20 days

More days to complete the project for Dylan and Ella compared to Zoe and Jonathan
= 20 - 11
= 9

Answer(s): 9