SOLUTION: Is it necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 60 liters of 20% solution. How many liters of this should be drained and re
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Question 720851: Is it necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 60 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
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The numerator is the amount of resulting pure antifreeze matter, and all concentrations are presented as decimalized fractions. u is the amount of pure antifreeze in liters as well as the amount of the material to remove from the radiator first. Solve for u.
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