A tank with a capacity of 210 liters, initially contains a solution with 20 kilograms of salt dissolved in 50 liters of water. A second solution containing 3 kilograms of dissolved salt per liter, runs into the tank at 4 liters every minute and that the mixture (kept uniform by stirring) runs out of the tank at the rate of 1 liter per minute. What is the concentration of the solution in the tank when the solution reached halfway level? Intermediate values should be rounded only to two decimal places. Round off the final answer to two decimal places.

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A: here we can use differential equation to solve this question.

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A: Question is solved.

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A: The solution of above question is written below.

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