GRE考试

【单选题】
A、rancher wishes to enclose a field that measures 12 feet by 27 feet. He purchases 76 feet of fencing material that must be affixed to posts at the corners, with no two posts being more than 6 feet apart. What is the least number of fence posts he will require to fence in this field
A、10
B、12
C、13
D、14
E、18
网考网参考答案：D
网考网解析：
When dealing with complicated geometry problems, it is helpful to draw a diagram. In this case, you would draw a rectangle measuring 12×27. Now label the posts. You know that there must be one post at each corner, and on the shorter sides there will need to be one post between the corner posts to ensure that no span is longer than 6 feet without being secured. For the longer stretch, you will need one post 6 feet from the northwest corner, one 12 feet in, one 18 feet in, and one 24 feet in. This will leave only 3 feet between the last post and the northeast corner, but this is unavoidable. Label posts on the other long side the same way, and count: There will be 14 posts required in all. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>