The initial amount of grass: i.
A cow eats a certain amount of grass in one day, call it c.
The field grows by a certain amount each day, call it g.
"i + 30 g - 30(120 c )= 0\\to 1.2 i + 36 g - 4320 c = 0"
Thus,
"g=12c"
It takes 12 cows to eat one day's growth in one day.
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