In a dairy farm, 20 cows eat 20 bags in 20 days. In how many days one cow will eat one bag of husk ?
In a dairy farm, 20 cows eat 20 bags in 20 days. In how many days one cow will eat one bag of husk ?
A. 10 days
B. 1/10 days
C. 20 days
D. 40 days
Answer : C. 20 days
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
1 * 20 * x = 20 * 1 * 20
x = 20.
