SOLUTION: A chemist has one solution that is 80% acid and another solution that is 30% acid. How much of the first (80%) solution is needed to make a 400 L solution that is 62% acid?

Question 419887: A chemist has one solution that is 80% acid and another solution that is 30% acid. How much of the first (80%) solution is needed to make a 400 L solution that is 62% acid?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 80% solution needed
Let = liters of 30% solution needed
given:
(1) L
acid in final solution is L
(2)
----------------
Multiply both sides of (1) by
and subtract from (2)
----------------
(2)
(1)

256 L of 80% solution are needed
check answer:
(2)
(2)

and

OK
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