Question
The efficiency ratio of D, E, and F is 1:2:5. Together,
they complete a project in 16 days. If D and E contribute for 14 days and leave, how long will F take to complete what's left?Solution
 Total work units = 16× (1 + 2 + 5) = 128 units.  Work done by D and E in 14 days = (14 × (1 + 2) = 42 units.  Remaining work = (128 - 42 = 86 units.  Time taken by F to complete the rest = (86 / 5) days = 17.2 days.
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