Question

A can complete a piece of work in 12 days, B in 18 days, and C in 36 days. They all work together for a few days, after which A leaves. B and C continue working and finish the remaining work in 3 days. How many days did they all work together initially?

A 3 days
B 0.85 days
C 0.75 days
D 1.6 days
E 1.2 days
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