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A alone can do frac 2 5 of a work in...

This question belongs to Arithmetic Ability Time And Work
Time and Work
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A alone can do $$\frac{2}{5}$$ of a work in 12 days. B is 25 percent more efficient than A. C alone can do the same work in 12 days less than B. D is 25 percent less efficient than C. If they all work together, then the work will be completed in how many days?

Answer & Solution
Correct Answer: Option B
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