2. 外语
  3. Brand R coffee costs $3. 25 per pound and brand T coffee costs $ 2. 50 per pound. Column A

Brand R coffee costs $3. 25 per pound and brand T coffee costs $ 2. 50 per pound. Column A

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问题 Brand R coffee costs $3. 25 per pound and brand T coffee costs $ 2. 50 per pound.

Column A                                            Column B
The number of pounds of brand R in a                1. 2
mixture of brands R and T that costs
$3. 00 per pound
选项 A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案D
解析 R牌咖啡每磅$3.25，T牌咖啡每磅$2.50。
解：本题的正确答案为(D)。比较的左项为R 与T混合后每磅值$3.00的咖啡中R牌咖啡的磅数。设R和T各有x和y磅，根据题意列出方程：3.25x+2.50y=3.00(x+y) => x=2y；显然，我们只能得到R和T两种牌子的咖啡在混和咖啡中所占的比例，若要求出R牌咖啡的确切重量，还必须给出混和咖啡的总重量或者T牌咖啡的重量。
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本试题收录于： GRE QUANTITATIVE题库GRE分类
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