SOLUTION: how many gallons of a 60% acid solution must be mixed with a 75% acid solution to obtain 20L of a 72% solution?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: how many gallons of a 60% acid solution must be mixed with a 75% acid solution to obtain 20L of a 72% solution?       Log On


   

Question 1049928: how many gallons of a 60% acid solution must be mixed with a 75% acid solution to obtain 20L of a 72% solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
how many gallons of a 60% acid solution must be mixed with a 75% acid solution to obtain 20L of a 72% solution?
----------
s = 60% amount
f = 75% amount
---
s + f = 20 (total solution)
60s + 75s = 20*72 (total acid)