If Grace and Rachel work together on a project, they will complete it in 8 days. If Rachel were to work with Emma on the same project, they will take a day longer. If Emma and Rael work together, they will take 100% more time than Grace and Rachel. If Grace and Rael were to work together, how many more days will they take to complete the project compared to Rachel and Emma working together?
Time taken by Grace and Rachel in percent = 100%
Time taken by Emma and Rael = 100% + 100% = 200%

Time taken by Grace and Rachel = 8 days ---- (1)
Time taken by Rachel and Emma = 9 days ---- (2)
Time taken by Emma and Rael = 200% x 8 = 16 days ---- (3)

(1) + (2) + (3)
Grace + Rachel + Rachel + Emma + Emma + Rael → 8 + 9 + 16 = 33 days
Grace + 2 (Rachel + Emma) + Rael → 33 days
Grace + Rael + 2 x 9 → 33 days
Grace + Rael → 33 - 18 = 15 days

More days to complete the project for Grace and Rael compared to Rachel and Emma
= 15 - 9
= 6

Answer(s): 6