A and b can do a piece of work in 30 and 40 days respectively they began the work together but a left after some days and b finish the remaining work in 19 days after how many days did a live
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A in 30 and B in 40
LCM OF 30 ,40 is 120
A effi, 4
B efficiency is 3
19 days work of B is 19×3=57 part work
remaining work = 120-57 = 63
One day work of A and B = 4+3=7
therefore they work together for 63÷7day
= 9 days
hence after 9 day A leave .
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