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题目
1. According to surveys at a company, 20 percent of the employees owned cell phones in 1994, and 60 percent of the employees owned cell phones in 1998. From 1994 to 1998, what was the percent increase in the fraction of employees who owned cell phones?
A. 3%
B. 20%
C. 30%
D. 200%
E. 300%
正确答案
D
题目解析
94年20%的人有手机,98年60%的人有手机,手机人数从20%增长到60%,其中增长的百分比为(60%-20%)/20%,也就是200%,所以选D。
2. The relationship between temperature C, in degrees Celsius, and temperature F, in degrees Fahrenheit, is given by the formula F = 9/5 *c + 32. If a recipe calls for an oven temperature of 210 degrees Celsius, what is the oven temperature in degrees Fahrenheit?
A. 320
B. 350
C. 410
D. 420
E. 500
正确答案
C
题目解析
给出了华氏和摄氏温度的转换公式,将210代入公式的C,得出F=410,选C。
3. In right triangle ABC, the ratio of the lengths of the two legs is 2 to 5. If the area of triangle ABC is 20, what is the length of the hypotenuse?
A. 7
B. 10
C. 4√5
D. √29
E. 2√29
正确答案
E
题目解析
直角三角形已知两直接边比例,根据面积为20,反推出两边分别是4和10,因此斜边长度等于√(16+100)=2√29,选E。
4. If an investment of P dollars is made today and the value of the inv...