7. A tank with a 200 gallon capacity is initially half full of water into which 30 grams of salt have been dissolved. A brine containing 5 grams of salt per gallon is pumped into the tank at a rate of 10 gallons per minute. The well-mixed solution is pumped out of the tank at a rate of 6 gallons per minute. Determine the amount of salt in the tank (in grams) at the exact moment the tank is completely full.

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