SOLUTION: Hi, I have tried this problem 2 different ways and I am still not getting correct answers. Can you show me the correct format. Find how many quarts of 6% butterfat milk and

Question 879396: Hi,
I have tried this problem 2 different ways and I am still not getting correct answers. Can you show me the correct format.
Find how many quarts of 6% butterfat milk and 3% butterfat milk should be mixed to yield 45 quarts of 4% butterfat milk?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = quarts of 6% milk needed
Let = quarts of 3% milk needed
----------------------------------
(1)
(2)
------------------------------
(2)
(2)
Multiply both sids of (1) by
and subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
---------------
15 quarts of 6% milk are needed
30 quarts of 3% milk are needed
----------------------------
check:
(2)
(2)
(2)
(2)
(2)
OK

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