SOLUTION: how many gallons of a 50% antifreeze solution must be mixed with 90 gallons of 15% antifreeze to get a mixture that is 40% antifreeze

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Question 206188: how many gallons of a 50% antifreeze solution must be mixed with 90 gallons of 15% antifreeze to get a mixture that is 40% antifreeze
Answer by Marth(57) About Me  (Show Source):
You can put this solution on YOUR website!
You have 90 gallons of a 15% antifreeze solution.
let x = the number of gallons of 50% antifreeze solution
90%2A0.15+%2B+0.5x+=+0.40%2890%2Bx%29
Solve for x.
13.5+%2B+0.5x+=+36%2B0.4x
0.1x+=+22.5
x = 225 gallons