If Robert and Samuel work together on a project, they will complete it in 5 days. If Samuel were to work with Layla on the same project, they will take a day longer. If Layla and Noah work together, they will take 80% more time than Robert and Samuel. If Robert and Noah were to work together, how many more days will they take to complete the project compared to Samuel and Layla working together?
Time taken by Robert and Samuel in percent = 100%
Time taken by Layla and Noah = 100% + 80% = 180%

Time taken by Robert and Samuel = 5 days ---- (1)
Time taken by Samuel and Layla = 6 days ---- (2)
Time taken by Layla and Noah = 180% x 5 = 9 days ---- (3)

(1) + (2) + (3)
Robert + Samuel + Samuel + Layla + Layla + Noah → 5 + 6 + 9 = 20 days
Robert + 2 (Samuel + Layla) + Noah → 20 days
Robert + Noah + 2 x 6 → 20 days
Robert + Noah → 20 - 12 = 8 days

More days to complete the project for Robert and Noah compared to Samuel and Layla
= 8 - 6
= 2

Answer(s): 2