SOLUTION: How many gallons of 40% antifreeze should be mixed with 10 gallons of 85% antifreeze to obtain 65% antifreeze mixture?

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Question 750825: How many gallons of 40% antifreeze should be mixed with 10 gallons of 85% antifreeze to obtain 65% antifreeze mixture?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many gallons of 40% antifreeze should be mixed with 10 gallons of 85% antifreeze to obtain 65% antifreeze mixture?
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Equation:
alcohol + alcohol = alcohol
0.40x + 0.85*10 = 0.65(x+10)
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40x + 85*10 = 65x + 65*10
20*10 = 15x
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x = (2/3)20
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x = 13 1/3 gallons (amt. of 40% solution needed)
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Cheers,
Stan H.
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