GRE Question of the Day (October 26)

Math

The stiffness of a diving board is proportional to the cube of its thickness and inversely proportional to the cube of its length. If diving board A is twice as long as diving board B and has 8 times the stiffness of diving board B, what is the ratio of the thickness of diving board A to that of diving board B? (Assume that the diving boards are equal in all respects other than thickness and length.)

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Question Discussion & Explanation

Correct Answer - 4 - (click and drag your mouse to see the answer)