SOLUTION: An amount of 40% acid solution is to be mixed wih enough 10% acid solution to make 25% acid solution. If there are to be 2o liters of the final mixture, how much of each solution s

Question 363416: An amount of 40% acid solution is to be mixed wih enough 10% acid solution to make 25% acid solution. If there are to be 2o liters of the final mixture, how much of each solution should be mixed together?
Found 2 solutions by josmiceli, Alan3354:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 40% solution needed
Let = liters of 10% solution needed
given:
= liters of alcohol in 40% solution
= liters of alcohol in 10% solution
= liters of alcohol in final solution
--------------------
(1)
(2)
from (1)
(1)
(1)
Subtract (2) from (1)

and

1 liter of 40% solution and 1 liter of 10% solution are needed
check:
(1)
(1)

OK
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Since 25% is the average of 10% and 40%, it's equal amounts.
Either 1 liter or 10 liters of each, depending on what 2o means.

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