A, B and C can do a work in 12,15 and 20 days respectively. They started working together but after 4 days A left. In how many days will B and C complete the work????
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Answer:
Step-by-step explanation:
Answer:
Step-by-step explanation:
A can do a piece of work in 12 days
B can do same piece of work in 15 days
C can do same piece of work in 20 days
LCM of 15,12,20 = 60
Rate of A = 60/12 = 5 units/day
Rate of B = 60/15 = 4 units/day
Rate of C = 60/20 = 3 units/day
If all of them work together, work done per day = 5 +4 + 3 = 12 units
For 4 days work done = 12x4=48 units
Work left after 4 days = 60 - 48 = 12 units
Time taken by A and B to complete = Work left / (rate of A+rate of B)=12/(4+3)=12/7=1.7 days
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