Officials begin to release water from a full man-made lake at a rate that would empty the lake in 6 weeks, but a river that can fill the lake in 20 weeks is replenishing the lake at the same time. how many weeks does it take to empty the lake? express your answer as a fraction reduced to lowest terms, if needed.
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Officials begin to release water from a full man-made lake at a rate that would empty the lake in 6...
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