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Assuming each cow consumes the same amount per day.

The farmer has enough for: 30 cows*28 days = 840 cow days

or 840 cows for 1 day

Therefore he can feed 840 cow*days/35days = 24 cows for 35 days.

30 cows - 24 cows = 6 cows

The farmer must get rid of 6 cows.

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