If Isaac and Joshua work together on a project, they will complete it in 10 days. If Joshua were to work with Anna on the same project, they will take a day longer. If Anna and Julie work together, they will take 100% more time than Isaac and Joshua. If Isaac and Julie were to work together, how many more days will they take to complete the project compared to Joshua and Anna working together?
Time taken by Isaac and Joshua in percent = 100%
Time taken by Anna and Julie = 100% + 100% = 200%

Time taken by Isaac and Joshua = 10 days ---- (1)
Time taken by Joshua and Anna = 11 days ---- (2)
Time taken by Anna and Julie = 200% x 10 = 20 days ---- (3)

(1) + (2) + (3)
Isaac + Joshua + Joshua + Anna + Anna + Julie → 10 + 11 + 20 = 41 days
Isaac + 2 (Joshua + Anna) + Julie → 41 days
Isaac + Julie + 2 x 11 → 41 days
Isaac + Julie → 41 - 22 = 19 days

More days to complete the project for Isaac and Julie compared to Joshua and Anna
= 19 - 11
= 8

Answer(s): 8