Question
Efficiency of 'D' is 80% more than that of 'E' and 25%
less than that of 'F'. They start working together, but 'E' leaves after 3 days, and the remaining work is completed by 'D' and 'F' together in 4 days. How long would it take for 'D' to complete the entire work alone?Solution
ATQ, 
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