A tank contains 400 liters of brine. Twelve (12) liters of brine, each containing 2.50 N of dissolved salt enter the tank per minute and the mixture kept uniform by stirring, leaves at the rate of 8 liters per minute. If the concentration is to be 2.00 N per liter at the end of one hour, how many newtons of salt were originally present in the tank?

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Q: required

A: Please refer to the image below

Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.