In a dairy farm, 30 cows eat 30 bags of husk in 30 days. In how many days one cow will eat one bag of husk?
Choose the correct answer
A) 1
B) 40
C) 20
D) 26
E) 30

Rationale: "explanation : one bag of husk = 30 cows per day ⇒ 30 × 1 × 30 = 1 × 30 × x for one cow = 30 days answer : e"
Answer: E