Antifreeze is a compound added to water to reduce the freezing point of a mixture. In extreme cold (less than -35 F), one car manufacturer recommends that a mixture of 75% antifreeze be used. How much 55% antifreeze solution should be drained from a 3–gal tank and replaced with pure antifreeze to produce a 75% antifreeze mixture? Round your answer to two decimal places if necessary.

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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.