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?
Choose the correct choice from the following.
A) 1 B) 40 C) 20 D) 26 E) 30
Explanation :   Assume that in x days, one cow will eat one bag of husk.   More cows, less days (Indirect proportion)   More bags, more days (direct proportion)   ⇒ 40 × 1 × 40 = 1 × 40 × x   ⇒ x = 40 Answer : Option 40
<result>B</result>
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?