If Mia and Rachel work together on a project, they will complete it in 9 days. If Rachel were to work with Charlotte on the same project, they will take a day longer. If Charlotte and Lucy work together, they will take 200% more time than Mia and Rachel. If Mia and Lucy were to work together, how many more days will they take to complete the project compared to Rachel and Charlotte working together?
Time taken by Mia and Rachel in percent = 100%
Time taken by Charlotte and Lucy = 100% + 200% = 300%

Time taken by Mia and Rachel = 9 days ---- (1)
Time taken by Rachel and Charlotte = 10 days ---- (2)
Time taken by Charlotte and Lucy = 300% x 9 = 27 days ---- (3)

(1) + (2) + (3)
Mia + Rachel + Rachel + Charlotte + Charlotte + Lucy → 9 + 10 + 27 = 46 days
Mia + 2 (Rachel + Charlotte) + Lucy → 46 days
Mia + Lucy + 2 x 10 → 46 days
Mia + Lucy → 46 - 20 = 26 days

More days to complete the project for Mia and Lucy compared to Rachel and Charlotte
= 26 - 10
= 16

Answer(s): 16