SOLUTION: If a student wants to mix a 45% acid solution with a 70% acid solution to create a 20 liter 60% acid solution, how many liters of 45% acid should they use?

Question 960987: If a student wants to mix a 45% acid solution with a 70% acid solution to create a 20 liter 60% acid solution, how many liters of 45% acid should they use?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 45% solution needed
Let = liters of 70% solution needed
--------------------------------------
(1)
(2)
-----------------------------
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)
---------------------------

and
(1)
(1)
--------------------
8 liters of 45% solution are needed
check:
(2)
(2)
You can finish this

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