Bunuel wrote:

A circular mat with diameter 20 inches is placed on a square tabletop, having its sides equal to 24 inches. Which of the following is closest to the fraction of the tabletop NOT covered by the mat?

(A) 1/2

(B) 3/5

(C) 2/3

(D) 1/4

(E) 9/20

Area of tabletop = 24^2 = 576

Area of circular mat = 10^2 * pi approximately equal to 314

314/576 is what is currently covered.

This is more than half. So what is not covered must be slightly less than half this directly eliminates A,B, and C

So answer choice E.

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