SOLUTION: A large solar heating panel requires 120 gallons of a fluid that is 30% antifreeze. The fluid comes in either a 50% solution or a 20% solution. How many gallons of each should be u

Question 507356: A large solar heating panel requires 120 gallons of a fluid that is 30% antifreeze. The fluid comes in either a 50% solution or a 20% solution. How many gallons of each should be used to prepare the 120 gallon solution.
My professor only wants us to set up the equation to solve, but not to actually solve. Thanks.
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
A large solar heating panel requires 120 gallons of a fluid that is 30% antifreeze. The fluid comes in either a 50% solution or a 20% solution. How many gallons of each should be used to prepare the 120 gallon solution.
My professor only wants us to set up the equation to solve, but not to actually solve.
**
let x=gallons of 50% solution
120-x=gallons of 20% solution
..
50%x+20%(120-x)=30%120
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