9 . P. Q and R can complete a piece of work in 15 days, 18 days and 20 days respectively. All the three started working together, but Q left the work 5 days before the completion, and R left the work three days after Q had left. How many days are required to finish the total work?
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Answer:
5/2
Step-by-step explanation:
1/15+1/20+1/18
LCM =180
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