A tank contains 100 gal of fresh water. A solution containing 0.5 lb/gal of soluble lawn fertilizer runs into the tank at the rate of 4 gal/min, and the mixture is pumped out of the tank at the rate of 4 gal/min. Find (a) The concentration of the fertilizer in the tank 25 minutes after the mixing process started. (b) How long does it take for the amount of fertilizer to reach 5 lb?

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