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)
$\therefore$ 1 x 40 x $ x $ = 40 x 1 x 40
$\Rightarrow x $ = 40.