Per week, one cow produces 108 liters / 6 cows = <<108/6=18>>18 liters/cow.

The cows produced 2160 liters of milk over 5 weeks.

So we have 2160 liters / 18 liters/cow = <<2160/18=120>>120 cows.

Further, we have to divide 120 cows / 5 weeks = <<120/5=24>>24 cows.

# Answer

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On a farm, on average every 6 cows produce 108 liters of milk per week. In five weeks the cows produced 2160 liters of milk. How many cows are on the farm?
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24
On a farm, on average every 6 cows produce 108 liters of milk per week. In five weeks the cows produced 2160 liters of milk. How many cows are on the farm?
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