If Jacob and Christopher work together on a project, they will complete it in 12 days. If Christopher were to work with Evan on the same project, they will take a day longer. If Evan and Hannah work together, they will take 50% more time than Jacob and Christopher. If Jacob and Hannah were to work together, how many more days will they take to complete the project compared to Christopher and Evan working together?
Time taken by Jacob and Christopher in percent = 100%
Time taken by Evan and Hannah = 100% + 50% = 150%

Time taken by Jacob and Christopher = 12 days ---- (1)
Time taken by Christopher and Evan = 13 days ---- (2)
Time taken by Evan and Hannah = 150% x 12 = 18 days ---- (3)

(1) + (2) + (3)
Jacob + Christopher + Christopher + Evan + Evan + Hannah → 12 + 13 + 18 = 43 days
Jacob + 2 (Christopher + Evan) + Hannah → 43 days
Jacob + Hannah + 2 x 13 → 43 days
Jacob + Hannah → 43 - 26 = 17 days

More days to complete the project for Jacob and Hannah compared to Christopher and Evan
= 17 - 13
= 4

Answer(s): 4