Discussion

Explanation:

28 men and 44 women can do a piece of work in 10 days.

If m and w are the number of days taken by a man and a woman to finish the work,

Then,

$\frac{28}{m}+\frac{44}{w}=\frac{1}{10}$

∴ $\frac{7}{m}+\frac{11}{w}=\frac{1}{40}$

∴ 7 men and 11 women can finish the work in 40 days.

Hence, option (c).

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