400
The first year, two cows produced 8100 litres of milk. The second year their production increased by 15% and 10% respectively, and the total amount of milk increased to 9100 litres a year. How many litres were milked from each cow each year?
the cows produced 3800 and 4300 litres of milk the first year, and 4370 4370 and 4730 4730 litres of milk the second year, respectively.