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A cistern contains 40 gallons of brine with 8 pounds of salt. Another brine solution containing...

A cistern contains 40 gallons of brine with 8 pounds of salt. Another brine solution containing 2 pounds of salt per gallon is pumped into the cistern at the rate of 4 gallons per minute and the mixture runs out at the same rate. If the cistern is constantly stirred, find the amount of salt in the cistern after T minutes

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