A can do a work in 24 days, B in 36 days, and C in 48 days. If they all work together for 2 days, how much of the work is left?

Answer: B. 1/3
Their combined work rate is 1/24 + 1/36 + 1/48 = 1/8. In 2 days, they complete 2/8 = 1/4 of the work, leaving 3/4 of the work.
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