Into a tank containing 100 gal of fresh water Wei Chen was to have added 10 lb

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Into a tank containing 100 gal of fresh water Wei Chen was to have added 10 lb of salt but accidentally added 20 lb instead. To correct her mistake she started adding fresh water at a rate of 3 gal / min. while drawing off well-mixed solution at the same rate. How long will it take until the tank contains the correct amount of salt?
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Differential Equations and Linear Algebra

ISBN: 978-0131860612

2nd edition

Authors: Jerry Farlow, James E. Hall, Jean Marie McDill, Beverly H. West

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