Find how many quarts of 6% butterfat milk should be mixed to yield 80 quarts of 5% butterfat milk.

Answer 1

60 quarts of 6% mixed with 20 quarts of 2% to get 80 quarts of 5%

6(60) + 2(20) = 5(80)

360 + 40 = 400

6 is within 1 of 5

2 is within 3 of 5

you need 3 times as much 6% as 2% to get 5%

60 = 3 times 20

Just solve the equation

6X+ 2(80-X) = 5(80)

X= quarts of 6%

80-X = quarts of 2%

(this assumes this is the same question that was posted elsewhere, but which had 2% in it)