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The unfolded rectangular prism looks like this:
_______
| |
|___24__|
|______|
| |
|___54__|
|______|
| |
|___36__|
|______|
The four rectangles at the bottom are the base of the rectangular prism, with the second rectangle having an area of 24 square inches. The top rectangle and the third rectangle make up the sides of the rectangular prism, with areas of 54 square inches and 36 square inches respectively.