If Hannah and Anthony work together on a project, they will complete it in 10 days. If Anthony were to work with Zoey on the same project, they will take a day longer. If Zoey and Zoe work together, they will take 140% more time than Hannah and Anthony. If Hannah and Zoe were to work together, how many more days will they take to complete the project compared to Anthony and Zoey working together?
Time taken by Hannah and Anthony in percent = 100%
Time taken by Zoey and Zoe = 100% + 140% = 240%

Time taken by Hannah and Anthony = 10 days ---- (1)
Time taken by Anthony and Zoey = 11 days ---- (2)
Time taken by Zoey and Zoe = 240% x 10 = 24 days ---- (3)

(1) + (2) + (3)
Hannah + Anthony + Anthony + Zoey + Zoey + Zoe → 10 + 11 + 24 = 45 days
Hannah + 2 (Anthony + Zoey) + Zoe → 45 days
Hannah + Zoe + 2 x 11 → 45 days
Hannah + Zoe → 45 - 22 = 23 days

More days to complete the project for Hannah and Zoe compared to Anthony and Zoey
= 23 - 11
= 12

Answer(s): 12