If Layla and Liam work together on a project, they will complete it in 10 days. If Liam were to work with Hannah on the same project, they will take a day longer. If Hannah and Sofia work together, they will take 60% more time than Layla and Liam. If Layla and Sofia were to work together, how many more days will they take to complete the project compared to Liam and Hannah working together?
Time taken by Layla and Liam in percent = 100%
Time taken by Hannah and Sofia = 100% + 60% = 160%

Time taken by Layla and Liam = 10 days ---- (1)
Time taken by Liam and Hannah = 11 days ---- (2)
Time taken by Hannah and Sofia = 160% x 10 = 16 days ---- (3)

(1) + (2) + (3)
Layla + Liam + Liam + Hannah + Hannah + Sofia → 10 + 11 + 16 = 37 days
Layla + 2 (Liam + Hannah) + Sofia → 37 days
Layla + Sofia + 2 x 11 → 37 days
Layla + Sofia → 37 - 22 = 15 days

More days to complete the project for Layla and Sofia compared to Liam and Hannah
= 15 - 11
= 4

Answer(s): 4