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1. |
If 40 men or 60 women or 80 children can do a piece of work in 6 months, then 10 men, 10 women and 10 children together do the work in ? |
A. | ${\text{5}}\frac{6}{{13}}{\text{ months}}$$ |
B. | ${\text{6 months}}$$ |
C. | ${\text{5}}\frac{7}{{13}}{\text{ months}}$$ |
D. | ${\text{11}}\frac{1}{{13}}{\text{ months}}$$ |
Answer» E. | |