Traditional Culture Encyclopedia - Weather forecast - Because of the cold weather, the grass on the pasture is not growing, but decreasing at a fixed rate.

Because of the cold weather, the grass on the pasture is not growing, but decreasing at a fixed rate.

(1) daily decrease of grass: (20×5-90)÷(6-5)= 10 (serving);

There was grass on the pasture before the cows ate grass.

10×5+20×5

=50+ 100,

= 150 (copies).

③ 150÷ 10- 10,

=5 (head).

Answer: You can feed 5 cows 10 day.