SOLUTION: how much 1% milk and how much 4% milk must be combined to obtain 60 liters of 2% milk

Question 777738: how much 1% milk and how much 4% milk must be combined to obtain 60 liters of 2% milk
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 1% milk needed
Let = liters of 4% milk needed
= liters of fat in 1% milk
= liters of fat in 4% milk
------------------------------
(1)
(2)
-----------------------------
(2)
(2)
(2)
-------------------
Subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
-------------
40 liters of 1% milk are needed
20 liters of 4% milk are needed
check:
(2)
(2)
(2)
(2)
(2)
OK
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