Question
A is twice as efficient as B, and B is thrice as
efficient as C. If C alone can complete a work in 30 days, then in how many days can they together complete the work?Solution
According to the question- C completes a work in 30 days.  B is three times as efficient as C. 3 ×B = 30 B = 10 days A is twice as efficient as B → 2 × A = 10 A = 5 days Then (A+B+C) together will finish the work. 5         10       30            30 6         3         1 Time =30/10=3days.
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