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OpenStudy (anonymous):
A tank contains 100 gal of brine made by dissolving 60 lb of salt in water. Salt water containing 1 lb of slat per gallon runs in at the rate of 2 gal/min and the well stirred mixture runs out at the same rate of 3 gal/min. i found the equation, its [x(t)=100-t-(40x10^(-6))(100-t)^(3), when whould the amout of salt in the tank be 25 lb?
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