2. 外语
  3. In a group of 200 male and female workers, 10 percent of the males smoke, and 49 percent of the females smoke. Quantity A: Total

In a group of 200 male and female workers, 10 percent of the males smoke, and 49 percent of the females smoke. Quantity A: Total

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问题 In a group of 200 male and female workers, 10 percent of the males smoke, and 49 percent of the females smoke.
Quantity A: Total number of workers who smoke
Quantity B: 59
选项 A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.
答案C
解析 处理这种应用题，先试着把文字描述转换成数学关系。设male worker的数量为x，则female的数量为200-x，Quantity A=0.1x+0.49(200-x)=98-0.39x，x的范围为0＜x＜200，所以20＜Quantity A＜98。这是我们能用数学的方法推断出的Quantity A的一个范围。根据这个范围，考生可能错误地选择D。
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