SOLUTION: According to new hospital standards a certain disinfectant solution needs to be 20% alcohol instead of 10% alcohol. There is a 40% alcohol disinfectant available to adjust the mixt

Question 810099: According to new hospital standards a certain disinfectant solution needs to be 20% alcohol instead of 10% alcohol. There is a 40% alcohol disinfectant available to adjust the mixture. Determine the amount of 10% solution and the amount of 40% solution to produce 30L of a 20% solution.
I am not sure on where to start and my teacher has not gone over any similar problems so I am really stuck. Please help me!?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 10% solution needed
Let = liters of 40% solution needed
-----------------
(1) liters
(2)
--------------------------
(2)
(2)
Subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
20 liters of 10% solution is needed
10 liters of 40% solution is needed
---------------------------
check answer:
(2)
(2)
(2)
(2)
(2)
(2)
OK
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