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A tank holds a 87 liter solution of alcohol and salt. Initially, the solution contains 7 grams of salt. Pure alcohol begins flowing into the tank at the rate of 2 liters per minute and the solution in the tank begins flowing out at a rate of 1 liter per minute. a. Find an expression for the amount of salt in the tank at any time. b. How much salt is present after 116 minutes? a. The amount of salt in grams,

`y`

, in the tank after

`t`

minutes is given by the following equation.

`y=`