SOLUTION: How many liters of 80% alcohol solution and 20% alcohol solution must be mixed to obtain 3 liters of 60% alcohol solution?

Question 1051506: How many liters of 80% alcohol solution and 20% alcohol solution must be mixed to obtain 3 liters of 60% alcohol solution?

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 80% alcohol solution needed
Let = liters of 20% alcohol solution needed
---------------------
(1)
(2)
-----------------------------
(2)
(2)
(2)
-----------------------
subtract (1) from (2)
(2)
(1)
--------------------

and
(1)
(1)
2 liters of 80% alcohol solution are needed
1 liter of 20% alcohol solution is needed
---------------------------------------
check:
(2)
(2)
(2)
(2)
(2)
OK

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