A large tank contains 90 litres of water in which 22 grams of salt is...
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A large tank contains 90 litres of water in which 22 grams of salt is dissolved. Brine containing 11 grams of salt per litre is pumped into the tank at a rate of 8 litres per minute. The well mixed solution is pumped out of the tank at a rate of 2 litres per minute.(a) Find an expression for the amount of water in the tank after t minutes.(b) Let x(t) be the amount of salt in the tank after t minutes. Which of the following is a differential equation for x(t)?
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