SOLUTION: A chemist is going to mix some 40% acid with some 65% acid in order to make 120 Liters of 50% acid. How many liters of the 40% acid will he use?

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Question 730145: A chemist is going to mix some 40% acid with some 65% acid in order to make 120 Liters of 50% acid. How many liters of the 40% acid will he use?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
A chemist is going to mix some L% acid with some H% acid in order to make M Liters of T% acid. How many liters of the L% acid will he use?

Let u = liters of L% acid, and v = liters of H% acid.

This is the system based on the description:
%28Lu%2BHv%29%2FM=T and u%2Bv=M.
Solve for u and v. The given question asks for u.