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 ?



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 ?

A. 1

B. 1/40

C. 40

D. 80

Answer : C. 40


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)
    Hence we can write as

    In a dairy farm, 40 cows eat 40 bags of husk
    1 x 40 x x = 40 x 1 x 40

    x = 40.



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