Digital PSAT Math Practice Question 255: Answer and Explanation

Question: 255

A certain cube has edges of length L inches, surface area of A square inches, and volume of B cubic inches. For what value of L would A = B?

Correct Answer: 6

Explanation:

6 A cube has six sides, so its surface area is given by the formula SA = 6L2. The volume of a cube is given by the formula V = L3. Set these two equations equal to one another:

6L2 = L3. You can divide both sides by L2 to obtain that 6 = L.

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