2. 外语
  3. The figure above shows some of the dimensions of a triangular plaza with an L-shaped walk along two of its edges．If the width of

The figure above shows some of the dimensions of a triangular plaza with an L-shaped walk along two of its edges．If the width of

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问题
The figure above shows some of the dimensions of a triangular plaza with an L-shaped walk along two of its edges．If the width of the walk is 4 feet and the total area of the plaza and walk together is 10，800 square feet，what is the value of x?
选项 A、200
B、204
C、212
D、216
E、225
答案A
解析 The area of the triangular plaza is given by (100 - 4) = 48x, and the area of the walkway is given by (x + 4)(4) + (96)(4). Since the total area of the plaza and walkway is 10,800, it follows that 52x + 400 = 10,800 and x = 200.
The correct answer is A.
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