a can do a piece of work in 20 days which B alone can do in 12 days B worked at it for 9 days a can finish the remaining work in
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A -------- 20 days
B-------- 12 days
L.C.M of 20&12 is 60. means total work is 60 unit
A's 1 day work --------- 3 unit
B's 1 day work --------- 5 unit
work done by B in 9 days is 5×9 = 45 unit
means 45 unit work B has finished and the remaining (60-45)=15 unit work will be finished by A
A's 1 day work is 3 unit so to complete 15 unit he will take 15/3 = 5 days.
B-------- 12 days
L.C.M of 20&12 is 60. means total work is 60 unit
A's 1 day work --------- 3 unit
B's 1 day work --------- 5 unit
work done by B in 9 days is 5×9 = 45 unit
means 45 unit work B has finished and the remaining (60-45)=15 unit work will be finished by A
A's 1 day work is 3 unit so to complete 15 unit he will take 15/3 = 5 days.
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A can do a piece of work in 1 day= 1/20 days.
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