SOLUTION: How much water should be added to 30 gallons of a solution that is 70% antifreeze to get a mixture that is 60% antifreeze

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: How much water should be added to 30 gallons of a solution that is 70% antifreeze to get a mixture that is 60% antifreeze       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


   



Question 1022003: How much water should be added to 30 gallons of a solution that is 70% antifreeze to get a mixture that is 60% antifreeze

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = gallons of water to be added
+.7%2A30+=+21+ = gallons of antifreeze in 70% solution
------------------
+21+%2F+%28+w+%2B+30+%29+=+.6+
+21+=+.6%2A%28+w+%2B+30+%29+
+21+=+.6w+%2B+18+
+.6w+=+3+
+w+=+5+
5 gallons of water must be added
----------------
check:
+21+%2F+%28+w+%2B+30+%29+=+.6+
+21+%2F+%28+5+%2B+30+%29+=+.6+
+21+%2F+35+=+.6+
+21+=+21+