If Rebecca and Hazel work together on a project, they will complete it in 11 days. If Hazel were to work with Audrey on the same project, they will take a day longer. If Audrey and Robert work together, they will take 200% more time than Rebecca and Hazel. If Rebecca and Robert were to work together, how many more days will they take to complete the project compared to Hazel and Audrey working together?
Time taken by Rebecca and Hazel in percent = 100%
Time taken by Audrey and Robert = 100% + 200% = 300%

Time taken by Rebecca and Hazel = 11 days ---- (1)
Time taken by Hazel and Audrey = 12 days ---- (2)
Time taken by Audrey and Robert = 300% x 11 = 33 days ---- (3)

(1) + (2) + (3)
Rebecca + Hazel + Hazel + Audrey + Audrey + Robert → 11 + 12 + 33 = 56 days
Rebecca + 2 (Hazel + Audrey) + Robert → 56 days
Rebecca + Robert + 2 x 12 → 56 days
Rebecca + Robert → 56 - 24 = 32 days

More days to complete the project for Rebecca and Robert compared to Hazel and Audrey
= 32 - 12
= 20

Answer(s): 20