If Evan and Anthony work together on a project, they will complete it in 10 days. If Anthony were to work with Rebecca on the same project, they will take a day longer. If Rebecca and Nathan work together, they will take 120% more time than Evan and Anthony. If Evan and Nathan were to work together, how many more days will they take to complete the project compared to Anthony and Rebecca working together?
Time taken by Evan and Anthony in percent = 100%
Time taken by Rebecca and Nathan = 100% + 120% = 220%

Time taken by Evan and Anthony = 10 days ---- (1)
Time taken by Anthony and Rebecca = 11 days ---- (2)
Time taken by Rebecca and Nathan = 220% x 10 = 22 days ---- (3)

(1) + (2) + (3)
Evan + Anthony + Anthony + Rebecca + Rebecca + Nathan → 10 + 11 + 22 = 43 days
Evan + 2 (Anthony + Rebecca) + Nathan → 43 days
Evan + Nathan + 2 x 11 → 43 days
Evan + Nathan → 43 - 22 = 21 days

More days to complete the project for Evan and Nathan compared to Anthony and Rebecca
= 21 - 11
= 10

Answer(s): 10