It is all about work
Algebra
Level
2
Sky, Lee and Marvin can do a piece of work in 24 days, 30 days and 40 days respectively. They began the work together but Marvin left 4 days before the completion of the work. In how many days was the work completed?
13 days
10 days
14 days
11 days
12 days
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d/24 + d/30 + (d-4)/40 = d/d = 1
12d - 12 = 120
d = 11 days
Marvin leaving dragged another day until completion.