Hi,

There is available 60 gallons of a 50% solution of glycerin and water. What volume of water must be added 

to the solution to reduce the glycerin concentration to 12% (88% water)  

      water = water (total gallons same on both sides)

 x + .50*60 = .88(x+60) 

      .22x = .33*60

         x = 90gal of water must be added



rstuv method

 1. Read the problem.

 2. Select the unknown.

 3. Translate into an equation: 

 4. Use the rules to solve.

 5. Verify the result

 

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