1. If a truck is traveling at a constant rate of 90kilometers per hour, how many seconds will it take the truck to travel a distance of 600 meters? (1 kilometer = 1000 meters)
A. 18
B. 24
C. 30
D. 36
E. 48
答案：B
解析：题干时速90公里的卡车需要多少秒通过600米的距离。首先换算时速90公里，90,000米/(60*60)秒=25米/秒，所以时间=距离/速度=600/25=24秒。
2. If the areas of the 4 squares are 50, 32, 18 and 12, what is the ratio of the small shaded portion to the area of the large shaded portion?(Note: Figure not drawn to scale)
GRE数学1
A. 1:8
B. 1:6
C. 1:4
D. 1:3
E. 1:1
答案：D
解析：题干问小的黑色阴影面积/大的黑色阴影面积等于多少。小的黑色阴影面积=18-12=6，大的黑色阴影面积=50-32=18，所以小的黑色阴影面积/大的黑色阴影面积=6/18=1:3
3. AB is the diameter of the circle. If AF=BF= 3√2，and AC=5, what is the area of square BCDE?
GRE数学
答案：11
解析：题干求正方形BCDE的面积，根据AF=BF=3 ，三角形ABF为直角三角形，得出AB=6。根据AC=5，三角形ABC为直角三角形，得出BC2=AB2-AC2=62-52=11。正方形BCDE的面积=BC2=11
4. In a group of 45 children, 60 percent of the children are boys, and 60 percent of the children are left-handed.
Column A：Number of boys who are left-handed
Column B：8
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
答案：A
解析：男孩的数量为45*60%=27, 用左手的人所占的百分比为60%, 所以用左手的男孩为27*60%=16.2. 而B是8. 所以A更大，所以选A.
5. X = sum of the first 31 positive odd integers
Y = sum of the first 30 positive even integers
Column A：X - Y
Column B：30
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
答案：B
解析：已知公式，和=[(首项+末项)*项数]/2. 项数= [(末项-首项)/公差]+1
X=1+3+5+7+…+31=(1+31)*16/2=256
Y=2+4+6+8+…+30=(2+30)*15/2=240
所以X-Y=256-240=16. 比30小，所以选B.
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