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## Homework Statement

## Homework Equations

## The Attempt at a Solution

A tank contains 4000L of pure water. Brine that contains 30g of salt per liter of water is pumped into the tank at a rate of 25L/min. Show that the concentration of salt after t minutes (in grams per liter) is C(t) = 30t/160+t

What happens to the concentration as t --> infinity

lim C(t)= ____________g/L

t --> infinity