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题库 / GMATAdvanced-PS-35
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?
200
204
212
216
225
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96x/2 + 100*4 + 4x = 10800
10400/52 = 200
不能直接用大三角形，因为最左侧没有延伸出去，只能用小三角形面积＋走道额外加上去