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a full tank with a capacity of 500 gal originally contains water with 200lb of salt....

a full tank with a capacity of 500 gal originally contains water with 200lb of salt. water containing 1lb of salt per gallon is entering at a rate of 4 gal/min and the mixture is allowed to flow out at a rate of 6 gal/min thus the tank is draining. how much salt is in the tank when it is half full?

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