If Lilian and Riordan work together on a project, they will complete it in 12 days. If Riordan were to work with Anthony on the same project, they will take a day longer. If Anthony and Luke work together, they will take 150% more time than Lilian and Riordan. If Lilian and Luke were to work together, how many more days will they take to complete the project compared to Riordan and Anthony working together?
Time taken by Lilian and Riordan in percent = 100%
Time taken by Anthony and Luke = 100% + 150% = 250%

Time taken by Lilian and Riordan = 12 days ---- (1)
Time taken by Riordan and Anthony = 13 days ---- (2)
Time taken by Anthony and Luke = 250% x 12 = 30 days ---- (3)

(1) + (2) + (3)
Lilian + Riordan + Riordan + Anthony + Anthony + Luke → 12 + 13 + 30 = 55 days
Lilian + 2 (Riordan + Anthony) + Luke → 55 days
Lilian + Luke + 2 x 13 → 55 days
Lilian + Luke → 55 - 26 = 29 days

More days to complete the project for Lilian and Luke compared to Riordan and Anthony
= 29 - 13
= 16

Answer(s): 16