¶ 2013 AMC8 Problem 18
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Problem:
Isabella uses one-foot cubical blocks to build a rectangular fort that is feet long, feet wide, and feet high. The floor and the four walls are all one foot thick. How many blocks does the fort contain?
Answer Choices:
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Solution:
The fort, including the inside, occupies a volume of 600 cubic feet. The inside of the fort is feet long, feet wide, and feet high, so it occupies a volume of cubic feet. Therefore the walls and floor occupy cubic feet, so the fort contains blocks.
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions