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Q: Tina can complete a piece of work in 10 days. Mina is $$ 33 {1\over3}$$%  less efficient than Tina. How many days are required to both to complete the work.

A. 8 days
B. 6 days
C. 12 days
D. 10 days
E. None of these
Answer» C. 12 days


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