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The primary purpose of the passage is to
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How many noncongruent triangles are there such that the length of each side of each triangle is an integer and the perimeter of each triangle is 15?
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In the figure above, what is the perimeter of the shaded region?
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List A consists of the 5 numbers x, x+ 1, x+ 1, x+ 1, and x+ 2, where x is a positive integer. List B is formed by adding 3 times the range of the numbers in list A to each number in list A. How much greater is the average (arithmetic mean) of the numbers in list B than the average of the numbers in list A?
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