SOLUTION: The cooling system on Peters Ford F-150 truck contains 6 gallons of coolant that is 40% antifreeze (the rest being water). How much must be withdrawn and replaced with 100% pure an

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Question 1018268: The cooling system on Peters Ford F-150 truck contains 6 gallons of coolant that is 40% antifreeze (the rest being water). How much must be withdrawn and replaced with 100% pure antifreeze to bring the mixture to 50% antifreeze level (the percentage most often recommended)l?
Found 2 solutions by josgarithmetic, stanbon:
Answer by josgarithmetic(39617) About Me  (Show Source):
Answer by stanbon(75887) About Me  (Show Source):
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The cooling system on Peters Ford F-150 truck contains 6 gallons of coolant that is 40% antifreeze (the rest being water). How much must be withdrawn and replaced with 100% pure antifreeze to bring the mixture to 50% antifreeze level (the percentage most often recommended)l?
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Equation:
active - active + active = active
0.40*6 - -0.40x + 1*x = 0.50*6
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40*6 - 40x + 100x = 50*6
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-10*6 +60x = 0
x = 1 gallon (amt. of antifreeze to withdraw and replace)
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Cheers,
Stan H.
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