1.

'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

Answer»

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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