GRE考试

【单选题】See the diagram on the following page for information to answer the questions.
At Tyler High School, there are twice as many girls as boys on the yearbook staff.At one staff meeting, the percentage of girls attending was twice the percentage of boys. What percent of those attending the meeting were boysA．20
B．25
C．30
D．33
E、50

网考网参考答案：A
网考网解析：
Even if you can do the algebra, this type of problem is easier if you use TACTIC 2, Chapter 11. Find some easy-to-use numbers. Assume that there are 100 girls and 50 boys on staff and that 20% of the girls and 10% of the boys attended the meeting. Then, 20 girls and 5 boys were there, and 5 is 20% of 25, the total number attending. **Of course, you can do this algebraically. If x represents the number of boys on staff, then 2x is the number of girls. If y% of the boys attended the meeting, then 2y% of the girls did. So, the number of boys attending was [*] whereas the number of girls attending was [*]. Therefore, there were 4 times as many girls in attendance as boys: [*] of those at the meeting were girls and [*] or 20% were boys. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>