If Grace and Samuel work together on a project, they will complete it in 6 days. If Samuel were to work with Maya on the same project, they will take a day longer. If Maya and Nora work together, they will take 200% more time than Grace and Samuel. If Grace and Nora were to work together, how many more days will they take to complete the project compared to Samuel and Maya working together?
Time taken by Grace and Samuel in percent = 100%
Time taken by Maya and Nora = 100% + 200% = 300%

Time taken by Grace and Samuel = 6 days ---- (1)
Time taken by Samuel and Maya = 7 days ---- (2)
Time taken by Maya and Nora = 300% x 6 = 18 days ---- (3)

(1) + (2) + (3)
Grace + Samuel + Samuel + Maya + Maya + Nora → 6 + 7 + 18 = 31 days
Grace + 2 (Samuel + Maya) + Nora → 31 days
Grace + Nora + 2 x 7 → 31 days
Grace + Nora → 31 - 14 = 17 days

More days to complete the project for Grace and Nora compared to Samuel and Maya
= 17 - 7
= 10

Answer(s): 10