4. A tank initially holds 80 gal of a brine solution containing 1/8 Ib of salt per gallon. At t = 0, another brine solution containing 1 lb of salt per gallon is poured into the tank at the rate of 4 gal/min, while the well-stirred mixture leaves the tank at the rate of 8 gal/min. Find the amount of salt when the tank contains exactly 60 gal of brine. O 20.156 Ibs O 20.625 Ibs O 15.625 Ibs O 22.656 Ibs

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A:

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