Determine an equation for the amount of salt


A 120 I tank initally haves 90kg or salt dissolved in 90 I of water. Brine containing 2 kg/I of salt flows in the tank at the rate of 4 I/min and the well-stirred mixture flows out of the tank at 3 I/min. Determine an equation for the amount of salt in the tank at time t in minutes.

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Mathematics: Determine an equation for the amount of salt
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