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 'A' and ' B ' can do a work in 20 and 30 days respectively. They began the work together, but 'A left after some time and ' B ' finished the remaining work in 5 days. Then what is the number of days a

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 'A' and ' B ' can do a work in 20 and 30 days respectively. They began the work together, but 'A left after some time and ' B ' finished the remaining work in 5 days. Then what is the number of days a

A). 8 days

B). 10 days

C). 12 days

D). 14 days


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Answered by on | Votes 0 |

10 days



B alone worked for 5 days 
work done by B in 5 days = 5/30 = 1/6
A + B together finished 1 - 1/6 = 5/6 work.
A + B do I work in 20x30/20x30 = 600/50 = 12 days
A + B do 5/6 work in 12 x 5/6 = 10 days.

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