Four black cows and three brown cows give as much milk in five days as three black cows and five brown cows give in four days Which color cow is a better milker and why?

Answer 1

The black cows are the better milkers because the amount of milk they produced per cow is greater than that from the brown cows.

This is a simple algebra problem. Let x = black cow and y = brown cow, solving as such:

4x = 5

3x = 4

3y = 5

5y = 4

4x + 3x = 9

7x = 9

x = 9/7 = 1.29 units per black cow

3y + 5y = 9

8y = 9

y = 9/8 = 1.13 units per brown cow