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GRE Practice Question for April 23rd

A circular plate with a diameter of 20 inches is placed on a circular placemat with a diameter of 24 inches. What fraction of the placemat's surface area is not covered?

Incorrect. While 144? is the total area of the placemat, this is not the correct simplified fraction of the surface area still uncovered. 

This is the credited response. This is the fraction of the placemat that is uncovered. 

Incorrect. This is the fraction of the placemat that IS covered. 

Incorrect. This is the ratio of the diameters, not the fraction of the placemat that is uncovered. 

Incorrect. It doesn't make sense that almost all of the placemat would be uncovered, considering how relatively close in number the diameters are. 

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