My car radiator can hold 20 quarts of liquid. Right now it holds a mixture of 25% antifreeze and 75% water. Since winter is coming, I want a higher percentage of antifreeze; my mechanic suggests a 38% mixture. I therefore need to drain off some of the current mixture and replace it with antifreeze. How much of the current mixture do I need to drain off? (Round your answer to 2 decimal places)

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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.