1999 AMC8 #1 · Algebra · ★
(6?3) + 4 - (2 - 1) = 5. To make this statement true, the question mark between the 6 and the 3 should be replaced by
要使等式 (6?3) + 4 - (2 - 1) = 5 成立，6 和 3 之间的问号应替换为
正确答案：A · 分值：1
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1999 AMC8 #2 · Geometry · ★
What is the degree measure of the smaller angle formed by the hands of a clock at 10 o'clock?
时钟在 10 点整时，时针和分针所形成较小角的度数是多少？
正确答案：C · 分值：1
用同分类同星级进入练习 →1999 AMC8 #3 · Algebra · ★
Which triplet of numbers has a sum NOT equal to 1?
下列哪组数字的和不等于 1？
正确答案：D · 分值：1
用同分类同星级进入练习 →1999 AMC8 #4 · Algebra · ★
The diagram shows the miles traveled by bikers Alberto and Bjorn. After four hours, about how many more miles has Alberto biked than Bjorn?
图中显示了骑行者 Alberto 和 Bjorn 行驶的英里数。四小时后，Alberto 比 Bjorn 大约多骑了多少英里？
正确答案：A · 分值：1
用同分类同星级进入练习 →1999 AMC8 #5 · Geometry · ★★
A rectangular garden 60 feet long and 20 feet wide is enclosed by a fence. To make the garden larger, while using the same fence, its shape is changed to a square. By how many square feet does this enlarge the garden?
一个长 60 英尺、宽 20 英尺的矩形花园用围栏围起来。为了使花园更大，同时使用同样的围栏，将其形状改为正方形。这样花园面积扩大了多少平方英尺？
正确答案：D · 分值：1
用同分类同星级进入练习 →1999 AMC8 #6 · Counting, Probability & Statistics · ★★
Bo, Coe, Flo, Jo, and Moe have different amounts of money. Neither Jo nor Bo has as much money as Flo. Both Bo and Coe have more than Moe. Jo has more than Moe, but less than Bo. Who has the least amount of money?
Bo、Coe、Flo、Jo 和 Moe 各自拥有不同数量的钱。Jo 和 Bo 都没有 Flo 的钱多。Bo 和 Coe 都比 Moe 的钱多。Jo 比 Moe 的钱多，但比 Bo 的钱少。谁的钱最少？
正确答案：E · 分值：1
用同分类同星级进入练习 →1999 AMC8 #7 · Algebra · ★★
The third exit on a highway is located at milepost 40 and the tenth exit is at milepost 160. There is a service center on the highway located three-fourths of the way from the third exit to the tenth exit. At what milepost would you expect to find this service center?
某高速公路的第三个出口位于 40 英里处，第十个出口位于 160 英里处。该高速公路上有一个服务区，位于第三个出口到第十个出口之间四分之三的位置。该服务区大约在哪个英里标处？
正确答案：E · 分值：1
用同分类同星级进入练习 →1999 AMC8 #8 · Geometry · ★★
Six squares are colored, front and back, (R = red, B = blue, O = orange, Y = yellow, G = green, and W = white). They are hinged together as shown, then folded to form a cube. The face opposite the white face is
六个正方形，正面和背面分别涂有颜色（R = 红色，B = 蓝色，O = 橙色，Y = 黄色，G = 绿色，W = 白色）。它们如图所示铰接在一起，然后折叠形成一个正方体。白色面相对的面颜色是什么？
正确答案：A · 分值：1
用同分类同星级进入练习 →1999 AMC8 #9 · Counting, Probability & Statistics · ★★
Three flower beds overlap as shown. Bed A has 500 plants, bed B has 450 plants, and bed C has 350 plants. Beds A and B share 50 plants, while beds A and C share 100. The total number of plants is
三个花坛如图所示重叠。花坛 A 有 500 株植物，花坛 B 有 450 株，花坛 C 有 350 株。花坛 A 和 B 共享 50 株，花坛 A 和 C 共享 100 株。植物的总数是
正确答案：C · 分值：1
用同分类同星级进入练习 →1999 AMC8 #10 · Counting, Probability & Statistics · ★★
A complete cycle of a traffic light takes 60 seconds. During each cycle the light is green for 25 seconds, yellow for 5 seconds, and red for 30 seconds. At a randomly chosen time, what is the probability that the light will NOT be green?
一个红绿灯的完整周期为 60 秒。每个周期中，绿灯亮 25 秒，黄灯亮 5 秒，红灯亮 30 秒。在随机一个时刻，灯不是绿色的概率是多少？
正确答案：E · 分值：1
用同分类同星级进入练习 →1999 AMC8 #11 · Counting, Probability & Statistics · ★★★
Each of the five numbers 1, 4, 7, 10, and 13 is placed in one of the five squares so that the sum of the three numbers in the horizontal row equals the sum of the three numbers in the vertical column. The largest possible value for the horizontal or vertical sum is
将五个数 1、4、7、10 和 13 分别放入五个方格中，使得横排三个数之和等于竖排三个数之和。水平或垂直和的最大可能值是
正确答案：D · 分值：1
用同分类同星级进入练习 →1999 AMC8 #12 · Algebra · ★★★
The ratio of the number of games won to the number of games lost (no ties) by the Middle School Middies is 11/4 . To the nearest whole percent, what percent of its games did the team lose?
中学 Middies 队赢的场数比输的场数（无平局）的比是 11/4。取最近的整数百分比，该队输掉的比赛占百分之多少？
正确答案：B · 分值：1
用同分类同星级进入练习 →1999 AMC8 #13 · Counting, Probability & Statistics · ★★★
The average age of the 40 members of a computer science camp is 17 years. There are 20 girls, 15 boys, and 5 adults. If the average age of the girls is 15 and the average age of the boys is 16, what is the average age of the adults?
一个计算机科学夏令营 40 名成员的平均年龄为 17 岁。其中有 20 名女生、15 名男生和 5 名成人。如果女生的平均年龄为 15 岁，男生的平均年龄为 16 岁，那么成人的平均年龄是多少？
正确答案：C · 分值：1
用同分类同星级进入练习 →1999 AMC8 #14 · Geometry · ★★★
In trapezoid , the sides and are equal. The perimeter of is
在梯形 中，边 和 相等。梯形 的周长是
正确答案：D · 分值：1
用同分类同星级进入练习 →1999 AMC8 #15 · Counting, Probability & Statistics · ★★★
Bicycle license plates in Flatville each contain three letters. The first is chosen from the set {C,H,L,P,R}, the second from {A,I,O}, and the third from {D,M,N,T}. When Flatville needed more license plates, they added two new letters. The new letters may both be added to one set or one letter may be added to one set and one to another set. What is the largest possible number of ADDITIONAL license plates that can be made by adding two letters?
Flatville 的自行车牌照各包含三个字母。第一个从 {C,H,L,P,R} 中选择，第二个从 {A,I,O} 中选择，第三个从 {D,M,N,T} 中选择。当 Flatville 需要更多牌照时，他们新增了两个新字母。这两个新字母可以都加入一个集合，或者一个字母加入一个集合、另一个加入另一个集合。通过添加两个字母，最多可以增加多少额外的牌照？
正确答案：D · 分值：1
用同分类同星级进入练习 →1999 AMC8 #16 · Algebra · ★★★
Tori's mathematics test had 75 problems: 10 arithmetic, 30 algebra, and 35 geometry problems. Although she answered 70% of the arithmetic, 40% of the algebra, and 60% of the geometry problems correctly, she did not pass the test because she got less than 60% of the problems right. How many more problems would she have needed to answer correctly to earn a 60% passing grade?
Tori 的数学考试有 75 道题：10 道算术，30 道代数，35 道几何。虽然她做对了 70% 的算术题、40% 的代数题和 60% 的几何题，但她没有通过考试，因为她做对的题目不到 60%。她还需要多做对多少道题才能达到 60% 的及格成绩？
正确答案：B · 分值：1
用同分类同星级进入练习 →1999 AMC8 #17 · Algebra · ★★★
At Central Middle School the 108 students who take the AMC 8 meet in the evening to talk about problems and eat an average of two cookies apiece. Walter and Gretel are baking Bonnie's Best Bar Cookies this year. Their recipe, which makes a pan of 15 cookies, lists this items: cups of flour, 2 eggs, 3 tablespoons butter, cups sugar, and 1 package of chocolate drops. They will make only full recipes, not partial recipes. Walter can buy eggs by the half-dozen. How many half-dozens should he buy to make enough cookies? (Some eggs and some cookies may be left over.)
中央中学 108 名参加 AMC 8 的学生晚上聚会讨论题目，平均每人吃两块曲奇。Walter 和 Gretel 今年正在烤 Bonnie's Best Bar Cookies。他们的配方可以做一盘 15 块曲奇，配料表如下： 杯面粉、2 个鸡蛋、3 汤匙黄油、 杯糖、1 包巧克力豆。他们只做完整的配方，不做部分配方。
Walter 可以按半打买鸡蛋。他应该买多少个半打鸡蛋才能做足够的曲奇？（可能会剩下一些鸡蛋和一些曲奇。）
正确答案：C · 分值：1
用同分类同星级进入练习 →1999 AMC8 #18 · Algebra · ★★★
At Central Middle School the 108 students who take the AMC8 meet in the evening to talk about problems and eat an average of two cookies apiece. Walter and Gretel are baking Bonnie's Best Bar Cookies this year. Their recipe, which makes a pan of 15 cookies, lists this items: cups flour, 2 eggs, 3 tablespoons butter, cups sugar, and 1 package of chocolate drops. They will make only full recipes, not partial recipes. They learn that a big concert is scheduled for the same night and attendance will be down 25% . How many recipes of cookies should they make for their smaller party?
中央中学 108 名参加 AMC8 的学生晚上聚会讨论题目，平均每人吃两块曲奇。Walter 和 Gretel 今年正在烤 Bonnie's Best Bar Cookies。他们的配方可以做一盘 15 块曲奇，配料表如下： 杯面粉、2 个鸡蛋、3 汤匙黄油、 杯糖、1 包巧克力豆。他们只做完整的配方，不做部分配方。
他们得知当晚有一场大型音乐会，参加人数将减少 25%。他们应该为缩小后的聚会做多少份配方？
正确答案：E · 分值：1
用同分类同星级进入练习 →1999 AMC8 #19 · Algebra · ★★★
At Central Middle School, the 108 students who take the AMC 8 meet in the evening to talk about problems and eat an average of two cookies apiece. Hansel and Gretel are baking Bonnie's Best Bar Cookies this year. Their recipe, which makes a pan of 15 cookies, lists these items: cups flour, 2 eggs, 3 tablespoons butter, cups sugar, and 1 package of chocolate drops. They will make full recipes, not partial recipes. Hansel and Gretel must make enough pans of cookies to supply 216 cookies. There are 8 tablespoons in a stick of butter. How many sticks of butter will be needed? (Some butter may be leftover, of course.)
中央中学 108 名参加 AMC 8 的学生晚上聚会讨论题目，平均每人吃两块曲奇。Hansel 和 Gretel 今年正在烤 Bonnie's Best Bar Cookies。他们的配方可以做一盘 15 块曲奇，配料表如下： 杯面粉、2 个鸡蛋、3 汤匙黄油、 杯糖、1 包巧克力豆。他们只做完整的配方，不做部分配方。
Hansel 和 Gretel 必须做足够的曲奇来供应 216 块。一条黄油有 8 汤匙。需要多少条黄油？（当然可能会剩下一些黄油。）
正确答案：B · 分值：1
用同分类同星级进入练习 →1999 AMC8 #20 · Geometry · ★★★
Figure 1 is called a "stack map." The numbers tell how many cubes are stacked in each position. Fig. 2 shows these cubes, and Fig. 3 shows the view of the stacked cubes as seen from the front.
Which of the following is the front view for the stack map in Fig. 4?
图 1 称为「堆叠图」。数字表示每个位置堆叠了多少个正方体。图 2 显示了这些正方体，图 3 显示了从前面看到的堆叠正方体的视图。
下列哪个是图 4 中堆叠图的前视图？
正确答案：B · 分值：1
用同分类同星级进入练习 →1999 AMC8 #21 · Geometry · ★★★
The degree measure of angle is
角 的度数是多少？
正确答案：B · 分值：1
用同分类同星级进入练习 →1999 AMC8 #22 · Algebra · ★★★
In a far-off land three fish can be traded for two loaves of bread and a loaf of bread can be traded for four bags of rice. How many bags of rice is one fish worth?
在某个遥远的地方，三条鱼可以换两条面包，一条面包可以换四袋米。一条鱼值多少袋米？
正确答案：D · 分值：1
用同分类同星级进入练习 →1999 AMC8 #23 · Geometry · ★★★★
Square has sides of length 3. Segments and divide the square's area into three equal parts. How long is segment ?
正方形 的边长为 3。线段 和 将正方形的面积分成相等的三部分。线段 的长度是多少？
正确答案：C · 分值：1
用同分类同星级进入练习 →1999 AMC8 #24 · Number Theory · ★★★★
When is divided by 5 , the remainder is
当 除以 5 时，余数是多少？
正确答案：B · 分值：1
用同分类同星级进入练习 →1999 AMC8 #25 · Geometry · ★★★★
Points , , and are midpoints of the sides of right triangle . Points , , are midpoints of the sides of triangle , etc. If the dividing and shading process is done 100 times (the first three are shown) and AC=CG=6 , then the total area of the shaded triangles is nearest
点 、 和 是直角三角形 各边的中点。点 、、 是三角形 各边的中点，以此类推。如果分割和着色过程进行 100 次（前三次如图所示）且 AC=CG=6，则着色三角形的总面积最接近
正确答案：A · 分值：1
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