If Joseph and Leah work together on a project, they will complete it in 12 days. If Leah were to work with Claire on the same project, they will take a day longer. If Claire and Rebecca work together, they will take 150% more time than Joseph and Leah. If Joseph and Rebecca were to work together, how many more days will they take to complete the project compared to Leah and Claire working together?
Time taken by Joseph and Leah in percent = 100%
Time taken by Claire and Rebecca = 100% + 150% = 250%

Time taken by Joseph and Leah = 12 days ---- (1)
Time taken by Leah and Claire = 13 days ---- (2)
Time taken by Claire and Rebecca = 250% x 12 = 30 days ---- (3)

(1) + (2) + (3)
Joseph + Leah + Leah + Claire + Claire + Rebecca → 12 + 13 + 30 = 55 days
Joseph + 2 (Leah + Claire) + Rebecca → 55 days
Joseph + Rebecca + 2 x 13 → 55 days
Joseph + Rebecca → 55 - 26 = 29 days

More days to complete the project for Joseph and Rebecca compared to Leah and Claire
= 29 - 13
= 16

Answer(s): 16