If Ella and Sofia work together on a project, they will complete it in 7 days. If Sofia were to work with Joseph on the same project, they will take a day longer. If Joseph and Sophia work together, they will take 200% more time than Ella and Sofia. If Ella and Sophia were to work together, how many more days will they take to complete the project compared to Sofia and Joseph working together?
Time taken by Ella and Sofia in percent = 100%
Time taken by Joseph and Sophia = 100% + 200% = 300%

Time taken by Ella and Sofia = 7 days ---- (1)
Time taken by Sofia and Joseph = 8 days ---- (2)
Time taken by Joseph and Sophia = 300% x 7 = 21 days ---- (3)

(1) + (2) + (3)
Ella + Sofia + Sofia + Joseph + Joseph + Sophia → 7 + 8 + 21 = 36 days
Ella + 2 (Sofia + Joseph) + Sophia → 36 days
Ella + Sophia + 2 x 8 → 36 days
Ella + Sophia → 36 - 16 = 20 days

More days to complete the project for Ella and Sophia compared to Sofia and Joseph
= 20 - 8
= 12

Answer(s): 12