A complete work in 12 days B complete work in 20 days..both A and B together work for 3 days after A left .Then how many days B takes to complete the work?
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total work is LCM of 20&12 that means 60. efficiency of A+B =8 (60÷12+60÷20) .A+B do 8 works in a day .so together in 3 days they do 24 works.so remaining work is 60-24=36.B will take 36÷3 =12 days to finish remaining work
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