Question 1167814: Find how many quarts of 4% butterfat milk and 1% butterfat milk should be mixed to yield 30 quarts of 3% butterfat milk. Answer by ikleyn(52817) (Show Source):
You mix x quarts of the 4% butterfat and (30-x) quarts of the 1% butterfat.
The equation for the butterfat is
0.04x + 0.01*(30-x) = 0.03*30
From the equation
x = = 20.
ANSWER. 20 quarts of the 4% butterfat milk and the rest, 30-20 = 10 quarts of the 1% butterfat milk.
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