A + B can do a piece of work in 6 days, B + C together in 20 days, C + A together in 7 1/2 day. How long will each require separately to do the same work?
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A+B = 1/6,B+C=1/20,C+A=2/15 days respectively
LCM of 6,20,15/2 = 60.
efficiency : A+B=10 units/day,
B+C=3 units/day
C+A=8 units/day.
(By solving the above equations )
A+B+C=21/2 units/day.
A=15/2 units/day =8 Days
B=5/2 units/day=24 days.
C=1/2 units/day=120 Days
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