SOLUTION: a car radiator has a capacity of 16 quarts and is filled with a 25% antifreeze solution. How much must be drained off and replaced with pure antifreeze to obtain a 40% antifreeze s

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Question 242284: a car radiator has a capacity of 16 quarts and is filled with a 25% antifreeze solution. How much must be drained off and replaced with pure antifreeze to obtain a 40% antifreeze solution? Make a table.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
a car radiator has a capacity of 16 quarts and is filled with a 25% antifreeze solution. How much must be drained off and replaced with pure antifreeze to obtain a 40% antifreeze solution? Make a table.
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Equation:
alcohol - alcohol + alcohol = alcohol
0.25*16 - 0.25x + 1.00x = 0.40*16
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Multiply thru by 100 to get:
25*16 - 25x + 100x = 40*16
75x = 15*16
x = 3.2 quarts (amount to be removed and replaced)
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Cheers,
Stan H.