If Audrey and Grace work together on a project, they will complete it in 10 days. If Grace were to work with Rebecca on the same project, they will take a day longer. If Rebecca and Lily work together, they will take 170% more time than Audrey and Grace. If Audrey and Lily were to work together, how many more days will they take to complete the project compared to Grace and Rebecca working together?
Time taken by Audrey and Grace in percent = 100%
Time taken by Rebecca and Lily = 100% + 170% = 270%

Time taken by Audrey and Grace = 10 days ---- (1)
Time taken by Grace and Rebecca = 11 days ---- (2)
Time taken by Rebecca and Lily = 270% x 10 = 27 days ---- (3)

(1) + (2) + (3)
Audrey + Grace + Grace + Rebecca + Rebecca + Lily → 10 + 11 + 27 = 48 days
Audrey + 2 (Grace + Rebecca) + Lily → 48 days
Audrey + Lily + 2 x 11 → 48 days
Audrey + Lily → 48 - 22 = 26 days

More days to complete the project for Audrey and Lily compared to Grace and Rebecca
= 26 - 11
= 15

Answer(s): 15