The amount of new grass per day is: (46÷2×9-27×6)÷(9-6)= 15 (serving).

27×6- 15×6=72 (copies)

72 ÷ (11+20 ÷ 2-15) =12 (days)

Because 1 cow eats what two sheep eat, what cows and young people eat is converted into cows eating grass.

Grass length: 23× 9-27× (12 ÷ 2) ÷ (9-6 ÷ 2) =15.

The amount of original grass on grassland: 23×9- 15×9=72.

1 1 The amount of grass eaten by one cow and 20 sheep is 2 1 cow.

72 ÷ (21-15) = 72 ÷ 6 =12 (days)

Answer: 1 1 One cow and 20 sheep can eat together 12 days.

The grazing amount of one cow is equal to two sheep, the daily grazing amount of 20 sheep is equal to 10 cattle, and the daily grazing amount of 46 sheep is equal to 23 cows.

How many cows eat grass every day?

20/2= 10 head

How many cows can you eat a day with the original amount of grass and 6 days of new grass?

27*6= 162 heads

46 sheep graze for 9 days. How many cows can you eat a day?

(46/2)*9=207 heads

How many cows can eat new grass every day?

(207-162)/(9-6) =15.

How many cows can you eat a day with the original grass?

162-(6* 15)=72 heads.

How many days can the original grass supply feed 1 1 cow and 20 sheep?

72/(20/2+115) =12 days.

The fastest answer, hope to adopt, thank you.