Find how many quarts of 4% butterfat milk and 1% butterfat milk should be mixed to yield 60 quarts of 2% butter fat milk.
4x + (60 -x)1 = 60*2
== > 3x = 60
== > x = 20 quarts
So, 20 quarts of 4% fat milk plus 40 quarts of 1% butterfat milk
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