SOLUTION: a radiator contains 16 quarts of fluid that is 15% antifreeze. in order to prepare for the winter joe wants the fluid to be 60% antifreeze. he has a supply of 75% antifreeze soluti

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Question 996497: a radiator contains 16 quarts of fluid that is 15% antifreeze. in order to prepare for the winter joe wants the fluid to be 60% antifreeze. he has a supply of 75% antifreeze solution. how many quarts should he drain and replace with his 75% antifreeze to get his desired mixture
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
.75*16+.15x-(.75*16)=.60
12+.15x-12= .6
x= 4
He needs 4 quarts at .15 and 12 quarts at .75 to obtain a .60 (60%) mix.
Proof:
4/16= .25 25% of the 16 quarts will be at a concentration of 15%
12/16= .75 75% of the 16 quarts will be at a concentration of 75%
.25*.15= .0375
.75*.75= .5625
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Total......0.6 or 60% We have the correct answer