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Q. Working individually, $A, B$ and $C$ can finish a piece of work in 16 days, 20 days and 30 days, respectively. In how many days can $A, B$ and $C$ together complete a work which is $3 \frac{1}{2}$ times the previous work?

Time and Work, Pipes and Cisterns

Solution:

Find the part of work finished by all of them in one day.