SOLUTION: The radiator of an automobile already contains 12 quarts of a 10% solution of alcohol. HOw much alcohol must be added to make a mixture of 20% alcohol? How much alcohol must be add
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Question 25568: The radiator of an automobile already contains 12 quarts of a 10% solution of alcohol. HOw much alcohol must be added to make a mixture of 20% alcohol? How much alcohol must be added to make a mixture containing 25% alcohol. I would really appreciate it if someone could help me Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! You start with 12 quarts; you add "x" quarts; you end up with "12+x" quarts.
Now follow the alcohol:
10%(12)+100%(x)=20%(12+x)
Multiply thru by 10 to get:
(12)+10(x)=2(12+x)
12+10x=24+2x
8x=12
x=1 1/2 quarts
Follow this same pattern to determine the number of quarts of
100% alcohol to get a 25% solution.
Cheers,
Stan H.
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