SOLUTION: i was delivered 500 gallons of sodium hydroxide 50% solution how much water needs to be added to get a 40% concentrate

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: i was delivered 500 gallons of sodium hydroxide 50% solution how much water needs to be added to get a 40% concentrate      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 802465: i was delivered 500 gallons of sodium hydroxide 50% solution how much water needs to be added to get a 40% concentrate
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = gallons of water to be added
+.5%2A500+=+250+ gallons of sodium hydroxide
-----------------
+250+%2F+%28+500+%2B+w+%29+=+.4+
+250+=+.4%2A%28+500+%2B+w+%29+
+250+=+200+%2B+.4w+
+.4w+=+50+
+w+=+125+
125 gallons of water must be added