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

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Question 391864: a car radiator has a capacity of 16 quarts and is filled with a 25% anifreeze solution, how much must be drained off and replaced with pure antifreeaze to obtain a 40 % antifreeze solution
Answer by stanbon(75887)   (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% anifreeze solution, how much must be drained off and replaced with pure antifreeaze to obtain a 40 % antifreeze solution
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Equation:
alcohol - alcohol + alcohol = alcohol
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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
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75x = 15*16
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x = (1/5)*16
x = 3 1/5 quarts (amt. that must be removed and replaced)
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Cheers,
Stan H.
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