Initially 10 grams of salt are dissolved into 30 liters of water. Brine with concentration of salt 3 grams per liter is added at a rate of 6 liters per minute. The tank is well mixed and drained at 6 liters per minute. Let x be the amount of salt, in grams, in the solution after t minutes have elapsed. Find a formula for the incremental change in the amount of salt, delta x, in terms of the amount of salt in the solution x and the incremental change in time delta t. delta x = ? grams Find a formula for the amount of salt, in grams, after t minutes have elapsed. x(t)= ? grams How long must the process continue until there are exactly 25 grams of salt in the tank? ? minutes

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