'A' can do a piece of work in 30 days and ' B ' alone can do it in 20 days. They work together for 4 days and then ' B ' leaves the job. 'A' will finish the remaining work in
Given
A's time = 30 days
B's time = 20 days
Formula Used
Efficiency =
Solution
Total Work = LCM(30, 20) = 60 units
A's efficiency = units/day
B's efficiency = = 3 units/day
Work done in 4 days together = = 20 units
Remaining work = 60 - 20 = 40 units
Time taken by A to finish = = 20 days
Final Answer
So the correct answer is (a)
English
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