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In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk?

1
$ \dfrac{1}{40} $
40
80
Explanation:

Let the required number of days be $ x $.

Less cows, More days (Indirect Proportion)

Less bags, Less days (Direct Proportion)

$\begin{cases}1 : 40 \\40 : 1 \end{cases}::40:x$

$\therefore$ 1 x 40 x $ x $ = 40 x 1 x 40

$\Rightarrow x $ = 40.

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