If Jack and Joseph work together on a project, they will complete it in 7 days. If Joseph were to work with Evan on the same project, they will take a day longer. If Evan and Ethan work together, they will take 100% more time than Jack and Joseph. If Jack and Ethan were to work together, how many more days will they take to complete the project compared to Joseph and Evan working together?
Time taken by Jack and Joseph in percent = 100%
Time taken by Evan and Ethan = 100% + 100% = 200%

Time taken by Jack and Joseph = 7 days ---- (1)
Time taken by Joseph and Evan = 8 days ---- (2)
Time taken by Evan and Ethan = 200% x 7 = 14 days ---- (3)

(1) + (2) + (3)
Jack + Joseph + Joseph + Evan + Evan + Ethan → 7 + 8 + 14 = 29 days
Jack + 2 (Joseph + Evan) + Ethan → 29 days
Jack + Ethan + 2 x 8 → 29 days
Jack + Ethan → 29 - 16 = 13 days

More days to complete the project for Jack and Ethan compared to Joseph and Evan
= 13 - 8
= 5

Answer(s): 5