A B and C can do a piece of work in 20 days,10 days and 15 days respectively. They all started the work together but after 2 days B left the work and A left the work 1.5 days before the completion of work. Find the time in which work gets completed ?
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A's one day work=W/20
B's one day work=W/10
C's one day work=W/15
one day work of A, B and C= W/20+W/10+W/15=13W/60
after 2 days= 26W/60
Left over work= W-26W/60=34W/60
A&C one day work=7W/60
C's 1.5 day work=W/15*1.5*4/4=6W/60
Left over work to be done by A&C= 34W/60-6W/60=28W/60
Job will be done by A&C=28W/7W=4 days
total no of days= 2+4+1.5=7.5 days
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