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Question
The ratio of the effeciencies of A ,B and C are in the ratio of 7:5:8. Working together then they complete a work in 42 days. B and C work together for 21 days and the remaining work was completely by A alone. Th e whole work was complete is:
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Answer
We know Total work=days*efficiency
here,Total efficiency=7+5+8=20
and Days =42.
Therefore Total work=20*42=840
Now(b+c)do the work in 21 days means (5+8)*21=273.
Total Work left=840-273=567.
A will do remaining work in 567/7=81 days.
