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2015年7月10日GRE数学考试真题解析
发布时间：2015年07月17日 来源：毕达留学
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GRE考试真题是大家备考的一个风向标，所以掌握真题是非常有必要的。下面，毕达留学精心整理了2015年7月10日GRE数学真题，希望帮助大家更好地备考。
1. The probability that event A will occur is 0.5
The probability that event B will occur is 0.4
The probability that event A or B will occur is 0.8
Column A Probability that A and B both occur
Column B 0.1
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
参考答案：C。通过题目条件可以得出AB同时发生的概率是0.1.
2. Yesterday, at a certain school, the ratio of boys to girls was 1 to 3. Today, an equal number of boys and girls joined the school. The number that joined was greater than zero and no students left.
Column A Ratio of boys to girls now
Column B 1/3
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
参考答案：A。(1+x)/(3+x)>1/3，因为x>0.
3. x is a positive integer less than 100. When x is divided by 5, the remainder is 4, and when x is divided by 23, the remainder is 7. What is the value of x?
参考答案：99.X要满足两个条件，x-4能被5整除，x-7能被23整除。
4. If k is an integer and 121 < k2 < 225, then k can have at most how many values?
A. 3
B. 4
C. 5
D. 6
E. 7
参考答案：D。K可以是12,13,14,-12,-13，-14.
5. When positive integer k is divided by 5, the remainder is 2. When k is divided by 6, the remainder is 5. If k is less than 40, what is the remainder when k is divided by 7?
A. 1
B. 2
C. 3
D. 4
E. 5
参考答案：C。通过条件可以得出k为17，故17/7,余3.
参考答案：1080.四边形内角和是360.故360*4-360=1080.
1. The probability that event A will occur is 0.5
The probability that event B will occur is 0.4
The probability that event A or B will occur is 0.8
Column A Probability that A and B both occur
Column B 0.1
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
参考答案：C。通过题目条件可以得出AB同时发生的概率是0.1.
2. Yesterday, at a certain school, the ratio of boys to girls was 1 to 3. Today, an equal number of boys and girls joined the school. The number that joined was greater than zero and no students left.
Column A Ratio of boys to girls now
Column B 1/3
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
参考答案：A。(1+x)/(3+x)>1/3，因为x>0.
3. x is a positive integer less than 100. When x is divided by 5, the remainder is 4, and when x is divided by 23, the remainder is 7. What is the value of x?
参考答案：99.X要满足两个条件，x-4能被5整除，x-7能被23整除。
4. If k is an integer and 121 < k2 < 225, then k can have at most how many values?
A. 3
B. 4
C. 5
D. 6
E. 7
参考答案：D。K可以是12,13,14,-12,-13，-14.
5. When positive integer k is divided by 5, the remainder is 2. When k is divided by 6, the remainder is 5. If k is less than 40, what is the remainder when k is divided by 7?
A. 1
B. 2
C. 3
D. 4
E. 5
参考答案：C。通过条件可以得出k为17，故17/7,余3.
参考答案：1080.四边形内角和是360.故360*4-360=1080.
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