Question

There are Brown and Black cows. In five days four black cows and 3 brown cows give as mush as milk that four brown cows and 5 black cows give in four days. If the black cow gives 10 liters of milk per day, how
many liters of milk the Brown cow will give in one

Answer 1

Black cow = 10 liters of milk a day

Let x be the amount of milk a brown cow gave in a day

Form the equation:

In five days four black cows and 3 brown cows give as mush as milk that four brown cows and 5 black cows give in four days.

⇒ 4(5 x 10) + 3 (5x) = 4( 4x) + 5(4 x 10)

Solve x:

4(5 x 10) + 3 (5x) = 4( 4x) + 5(4 x 10)

200 + 15x = 16x + 200

x = 0

Answer: The brown cow gives 0 liters of milk a day.