1、GRE（ QUANTITATIVE）练习试卷 6及答案与解析 1 Tom had 6 books. He gave 2 to his sister and then purchased 3 more books at the bookstore. Which of the following mathematical expressions is equivalent to the number of books that Tom now has? _6-2+3 _6+2-3 _6(2+3) _6(2-3) 2 Juan walked 3 more miles than Rebecca. Re
2、becca walked 4 times as far as William. William walked 2 miles. Which of the following mathematical expressions is equivalent to the number of miles Juan walked? _342 _(2+4)3 _4(2)+3 _4+3+2 3 Tina goes to the store to purchase some CDs and DVDs. CDs cost $15 and DVDs cost $18. Which of the following
3、 expressions gives the total amount of money, in dollars, Tina will pay for purchasing 2 of the CDs and D of the DVDs? _15+D _30+18D _18+D+30 _D(18+15) 4 Mark is older than Frank, but younger than David. If m, f, and d represent the ages, in years, of Mark, Frank, and David, respectively, which of t
4、he following is true? _d f m _f m d _d m f _f d m 5 Kathy was twice as old as Jim 2 years ago. Today, Jim is j years old. In terms of j, how old was Kathy 2 years ago? _2(j-2) _2j-2 _2(j+2) _j(2+2) GRE（ QUANTITATIVE）练习试卷 6答案与解析 1 【正确答案】 You are given that Tom started out with 6 books. After he gave
5、2 books to his sister he was left with (6-2) books. He then purchased 3 more books, so he now has (6-2+3) books. 2 【正确答案】 To solve this problem, start with William and work backward. William walked 2 miles, and Rebecca walked 4 times as far as William. Therefore, Rebecca walked 4(2) miles. Juan walk
6、ed 3 more miles than Rebecca, so Juan walked 4(2)+3 miles. 3 【正 确答案】 The first step is to calculate the total cost of the CDs: 2(15)=30. You are given that, in addition to the 2 CDs, Tina also purchases D of the DVDs, each of which costs $18. Therefore, her cost for the DVDs was 18D. Now simply add
7、the terms together to get 30+18D. 4 【正确答案】 You are given that Mark, m, is older than Frank, f. Therefore, f m. You are also given that Mark, m, is younger than David, d. Therefore, d m. Marks age is between Frank and Davids ages, so f m d. 5 【正确答案】 You are given that Jim is j years old today; therefore, 2 years ago Jim would have been j-2 years old. At that time, Kathy was twice as old as Jim, or 2(j-2).
