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題目
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%
正確答案
D
題目解析
94年20%的人有手機(jī)，98年60%的人有手機(jī)，手機(jī)人數(shù)從20%增長(zhǎng)到60%，其中增長(zhǎng)的百分比為(60%-20%)/20%，也就是200%，所以選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
正確答案
C
題目解析
給出了華氏和攝氏溫度的轉(zhuǎn)換公式，將210代入公式的C，得出F=410，選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
正確答案
E
題目解析
直角三角形已知兩直接邊比例，根據(jù)面積為20，反推出兩邊分別是4和10，因此斜邊長(zhǎng)度等于√(16+100)=2√29，選E。
4. If an investment of P dollars is made today and the value of the investment doubles every 7 years, what will be the value of the investment, in dollars, 28 years from today?
A. 8*(P^4)
B. P^4
C. 16*p
D. 8*p
E. 4*p
正確答案
C
題目解析
假設(shè)每年利息x，7年后本金翻倍：P*x^7=2P，x=2^(1/7)，28年后就是P*x^28=P*2^4，也就是8*P，所以選C。
5. R is a list of 15 consecutive integers, and T is a list of 21 consecutive integers. The median of the integers in list R is equal to the least integer in list T. If the two lists are combined into one list of 36 integers, how many different integers are on the combined list?
A. 25
B. 27
C. 28
D. 32
E. 36
正確答案
C
題目解析
兩個(gè)連續(xù)的整數(shù)數(shù)列R和T，其中R的中位數(shù)等于T的最小數(shù)，求兩個(gè)數(shù)列合并后會(huì)有多少個(gè)不重復(fù)的整數(shù)。因?yàn)镽的中衛(wèi)數(shù)等于T的最小數(shù)，且R一共有15個(gè)數(shù)字，因此從R的第八個(gè)整數(shù)開始往后的一共8個(gè)整數(shù)將和T中的前8個(gè)整數(shù)重復(fù)，所以兩者合并后不重復(fù)整數(shù)數(shù)量應(yīng)該是15+21-8=28個(gè)，所以選C。
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