SOLUTION: A chemical company makes two brands of antifreeze. The first brand is 45% pure antifreeze, and the second brand is 70% pure antifreeze. In order to obtain 150 gallons of a mix

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: A chemical company makes two brands of antifreeze. The first brand is 45% pure antifreeze, and the second brand is 70% pure antifreeze. In order to obtain 150 gallons of a mix      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 1037775: A chemical company makes two brands of antifreeze. The first brand is
45% pure antifreeze, and the second brand is 70% pure antifreeze. In order to obtain 150 gallons of a mixture that contains 55% pure antifreeze, how many gallons of each brand of antifreeze must be used?

First brand: ? Gallons
Second brand: ? Gallons
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Let n be the amount of 70% antifreeze. Then:
.7n+.45(150-n)=.55(150)
.7n+67.5-.45n=82.5
.25n=15
n=15/.25=60
You need 60 gallons of 70% antifreeze, and 90 gallons of 45% antifreeze for this mixture!!!!!!!!!!!!!