You want to ship a cylindrical container of maximum volume via the U.S. Postal Office. The post office limits the size of your container by insisting that the length of the cylinder, L, plus its girth (the circumference of the circular cross-section having radius R) be limited to a total of 84 inches. Find the length, L, radius, R, and the volume, V, of the cylinder having the maximum positive volume.

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Step-by-step explanation:

Hey there! I'm happy to help!

When working with percents, the word "is" means "equals". We can use this to make an equation. The decimal form of 40% is 0.4. Our number will be represented by the variable n.

22=0.4n

Flip equation around so n is on the left (you don't have to do this, but I like having the variable on the left)

0.4n=22

We divide both sides by 0.4

n=55

Therefore, your answer is B) 55.

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