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A can do a piece of work in 40 days; B can do the same in 30 days. A started alone but left the work after 10 days, then B worked at it for 10 days. C finished the remaining work in 10 days. C alone can do the whole work in?

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  1.  24 days

  2.  30 days

  3.  44 days

  4.  17 1/2 days

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