GRE考试

根据网考网考试中心的统计分析，以下试题在2019/7/17日GRE考试习题练习中，答错率较高，为：78%
【单选题】
A、receptionist typed 8 memos, each either 1 or 2 pages long. If the receptionist typed 12 pages in all, how many of the memos had 2 pages
A、1
B、2
C、3
D、4
E、5
网考网参考答案：D，答错率：78%
网考网试题解析：
To solve this problem, set x = the number of 1-page memos typed. The number of 2-page memos typed will equal 8-x. Add the total number of pages typed from 1-page memos, x, to the total number of pages typed from 2-page memos: x+2(8-x)=12. Solve for x: x+2(8-x)=12 x+16-2x=12 x=4 Because the question asks for how many 2-page memos the receptionist typed, substitute x=4 into 8-x to yield an answer of 4. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>