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.


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