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
-
- 1 x 40 x x = 40 x 1 x 40
- x = 40.
