We want to find how much time the food would last for only two cows, knowing that 8 cows could eat for 10 days.
With the same amount of grass, the 2 cows could eat for 40 days.
Assuming that each cow eats a quantity N of grass per day.
Then if 8 cows can eat for 10 days, the amount of food that we have is:
food = 8*10*N = 80*N
Now we want to know how many days 2 cows can be feed with that amount of food.
Two cows should eat 2*N of food in one day, then the number of days that the two cows can eat is given by:
days = (80*N)/(2*N) = 40
This means that with the same amount of grass the 2 cows could eat for 40 days.
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