1.On a given day, 50 people took a test that is designed to measure a candidate’s aptitude. Some of the 50 people will take the test in the morning, and the remaining of the 50 people will take the test in the afternoon. What is the average (arithmetic mean) score on the test for the 50 examinees?
答案是E。为什么？
2.If $1,000 will be deposited in a bank account and I is the dollar amount of interest earned from the original deposit, represented as , and the annual interest rate is r percent, is r ＞ 8 percent?
(1) The deposit earns a total of $210 in interest in the first 2 years.
(2) （1+r/100)^2>1.15
答案是A，为什么？
3.
Each person who attended a company meeting was either a stockholder in the company, an employee of the company, or both. If 62 percent of those who attended the meeting were stockholders and 47 percent were employees, what percent were stockholders, who were not employees?
答案是C，怎么做啊？
If x,y ,and z are positive integers,is xz even?
(1)xy is even.
(2)yz is even.
答案是E，求解答。
上面所有的问题的答案都是题目给的答案，我也不懂对还是错，求解释，感谢感谢。作者: shangcailanru 时间: 2013-1-4 21:46
