SOLUTION: Cream is approximately 22% butterfat. How many gallons of cream must be mixed with milk testing at 2% butterfat to get 20 gallons of milk containing 4% butterfat?

Question 560444: Cream is approximately 22% butterfat. How many gallons of cream must be mixed with milk testing at 2% butterfat to get 20 gallons of milk containing 4% butterfat?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = gallons of cream needed
Let = gallons of milk needed
given:
= gallons of butterfat in cream used
= gallons of butterfat in milk used
--------
(1)
(2)
---------------------------
(2)
(2)
(2)
(2)
Subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
2 gallons of cream must be used
check answer:
(2)
(2)
(2)
(2)
OK
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