If C alone can complete two-third part of a work in 12 days, then in how many days C can complete the whole work?
Given, C can complete $$\dfrac{2}{3}rd$$ part of work in 12 days.
$$\dfrac{2}{3} --> 12$$
$$1 --> ?$$
Total work will be completed in $$1\times\dfrac{12}{2}\times3 = 18$$ days
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