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A can do a piece of work alone in 12 days. B is 20% more efficient than A, and C is 25% more efficient than B. In how many days can B and C together complete the work?
$$\frac{35}{9}$$ days
$$\frac{40}{9}$$ days
$$\frac{35}{7}$$ days
$$\frac{40}{7}$$ days
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