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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