If Harris and Christian work together on a project, they will complete it in 6 days. If Christian were to work with Salik on the same project, they will take a day longer. If Salik and Sofia work together, they will take 100% more time than Harris and Christian. If Harris and Sofia were to work together, how many more days will they take to complete the project compared to Christian and Salik working together?
Time taken by Harris and Christian in percent = 100%
Time taken by Salik and Sofia = 100% + 100% = 200%

Time taken by Harris and Christian = 6 days ---- (1)
Time taken by Christian and Salik = 7 days ---- (2)
Time taken by Salik and Sofia = 200% x 6 = 12 days ---- (3)

(1) + (2) + (3)
Harris + Christian + Christian + Salik + Salik + Sofia → 6 + 7 + 12 = 25 days
Harris + 2 (Christian + Salik) + Sofia → 25 days
Harris + Sofia + 2 x 7 → 25 days
Harris + Sofia → 25 - 14 = 11 days

More days to complete the project for Harris and Sofia compared to Christian and Salik
= 11 - 7
= 4

Answer(s): 4