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A piece of rectangular glass is twice as long as it is wide, and its perimeter is 54 decimeters. What is the area of this rectangle?
Length: width = 2:1, the total number of parts of the sum of length and width: 1 + 2 = 3, the sum of length and width: 54 △ 2 = 27 (decimeter), then the length is 27 × 23 = 18 (decimeter), the width is 27 × 13 = 9 (decimeter), and the area of the rectangle is 18 × 9 = 162 (square decimeter). A: the area of the rectangle is 162 square decimeter
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