Questions on Word Problems: Mixtures answered by real tutors!

Algebra ->  Algebra  -> Customizable Word Problem Solvers  -> Mixtures -> Questions on Word Problems: Mixtures answered by real tutors!     (Log On)
Ad: Over 600 Algebra Word Problems at edhelper.com
Ad: Algebra Solved!™: algebra software that solves YOUR algebra homework problems with step-by-step help!

   

Question 149893: How many liters of a 60% salt solution must be added to 20 liters of a 12% salt solution to produce a 40% salt solution?: How many liters of a 60% salt solution must be added to 20 liters of a 12% salt solution to produce a 40% salt solution?
Answer by mangopeeler07(428) About Me  (Show Source):
You can put this solution on YOUR website!
x=# liters
(in parentheses)=# liters
coefficient=percent

60x+12(20)=40(20+x)

Distribute
60x+240=800+40x

Subtract 240 from each side
60x=560+40x

Subtract 40x from both sides
20x=560

Divide by 20
x=28

28 liters