If Liam and Robert work together on a project, they will complete it in 5 days. If Robert were to work with Emily on the same project, they will take a day longer. If Emily and David work together, they will take 140% more time than Liam and Robert. If Liam and David were to work together, how many more days will they take to complete the project compared to Robert and Emily working together?
Time taken by Liam and Robert in percent = 100%
Time taken by Emily and David = 100% + 140% = 240%

Time taken by Liam and Robert = 5 days ---- (1)
Time taken by Robert and Emily = 6 days ---- (2)
Time taken by Emily and David = 240% x 5 = 12 days ---- (3)

(1) + (2) + (3)
Liam + Robert + Robert + Emily + Emily + David → 5 + 6 + 12 = 23 days
Liam + 2 (Robert + Emily) + David → 23 days
Liam + David + 2 x 6 → 23 days
Liam + David → 23 - 12 = 11 days

More days to complete the project for Liam and David compared to Robert and Emily
= 11 - 6
= 5

Answer(s): 5