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

Time taken by Nathan and Dylan = 10 days ---- (1)
Time taken by Dylan and Sofia = 11 days ---- (2)
Time taken by Sofia and Sebastian = 210% x 10 = 21 days ---- (3)

(1) + (2) + (3)
Nathan + Dylan + Dylan + Sofia + Sofia + Sebastian → 10 + 11 + 21 = 42 days
Nathan + 2 (Dylan + Sofia) + Sebastian → 42 days
Nathan + Sebastian + 2 x 11 → 42 days
Nathan + Sebastian → 42 - 22 = 20 days

More days to complete the project for Nathan and Sebastian compared to Dylan and Sofia
= 20 - 11
= 9

Answer(s): 9