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

Time taken by Isaiah and Caleb = 11 days ---- (1)
Time taken by Caleb and Anna = 12 days ---- (2)
Time taken by Anna and Zoe = 200% x 11 = 22 days ---- (3)

(1) + (2) + (3)
Isaiah + Caleb + Caleb + Anna + Anna + Zoe → 11 + 12 + 22 = 45 days
Isaiah + 2 (Caleb + Anna) + Zoe → 45 days
Isaiah + Zoe + 2 x 12 → 45 days
Isaiah + Zoe → 45 - 24 = 21 days

More days to complete the project for Isaiah and Zoe compared to Caleb and Anna
= 21 - 12
= 9

Answer(s): 9