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1989 AMC8 #4 · Algebra · ★
Estimate to determine which of the following numbers is closest to 4010.205\displaystyle \frac{401}{0.205} .
估算 4010.205\displaystyle \frac{401}{0.205} 最接近以下哪个数。

正确答案：E · 分值：1

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1989 AMC8 #6 · Algebra · ★★
If the markings on the number line are equally spaced, what is the number yy ?
如果数轴上的标记是等间距的，数 yy 是多少？

正确答案：C · 分值：1

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1989 AMC8 #7 · Algebra · ★★
If the value of 20 quarters and 10 dimes equals the value of 10 quarters and nn dimes, then n=
如果 20 个 25 分硬币和 10 个 10 分硬币的总价值等于 10 个 25 分硬币和 nn 个 10 分硬币的总价值，则 n=

正确答案：D · 分值：1

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1989 AMC8 #9 · Algebra · ★★
There are 2 boys for every 3 girls in Ms. Johnson's math class. If there are 30 students in her class, what percent of them are boys?
Ms. Johnson 的数学班上每 2 个男生对应 3 个女生。如果她班上有 30 名学生，男生占百分之多少？

正确答案：C · 分值：1

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1989 AMC8 #10 · Geometry · ★★
What is the number of degrees in the smaller angle between the hour hand and the minute hand on a clock that reads seven o'clock?
时钟显示七点整时，时针和分针之间较小角的度数是多少？

正确答案：D · 分值：1

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1989 AMC8 #11 · Geometry · ★★★
Which of the five "T-like shapes" would be symmetric to the one shown with respect to the dashed line?
五个"T 形图形"中，哪个与所示图形关于虚线对称？

正确答案：B · 分值：1

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1989 AMC8 #14 · Counting, Probability & Statistics · ★★★
If a single digit is placed in each of the boxes of this subtraction problem, what is the smallest difference that is possible?
如果在每个方框中各放一个一位数字，这个减法算式的最小可能差是多少？

正确答案：C · 分值：1

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1989 AMC8 #15 · Geometry · ★★★
The area of the shaded region BEDCBEDC in parallelogram ABCDABCD is
平行四边形 ABCDABCD 中阴影区域 BEDCBEDC 的面积是

正确答案：D · 分值：1

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1989 AMC8 #16 · Number Theory · ★★★
In how many ways can 47 be written as the sum of two primes?
有多少种方式可以将 47 写成两个质数之和？

正确答案：A · 分值：1

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1989 AMC8 #17 · Algebra · ★★★
The number NN is between 9 and 17 . The average of 6 , 10 , and NN could be
数 NN 在 9 到 17 之间。6、10 和 NN 的平均数可能是

正确答案：B · 分值：1

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1989 AMC8 #18 · Algebra · ★★★
Many calculators have a reciprocal key 1x\displaystyle \boxed{\frac{1}{x}} that replaces the current number displayed with its reciprocal. For example, if the display is 00004\boxed{00004} and the 1x\displaystyle \boxed{\frac{1}{x}} key is depressed, then the display becomes 000.25\boxed{000.25} . If 00032\boxed{00032} is currently displayed, what is the fewest number of times you must depress the 1x\displaystyle \boxed{\frac{1}{x}} key so the display again reads 00032\boxed{00032} ?
许多计算器有一个倒数键 1x\displaystyle \boxed{\frac{1}{x}}，将当前显示的数替换为其倒数。例如，如果显示为 00004\boxed{00004} 并按下 1x\displaystyle \boxed{\frac{1}{x}} 键，则显示变为 000.25\boxed{000.25}。如果当前显示 00032\boxed{00032}，最少需要按多少次 1x\displaystyle \boxed{\frac{1}{x}} 键才能使显示再次变为 00032\boxed{00032}？

正确答案：B · 分值：1

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1989 AMC8 #19 · Counting, Probability & Statistics · ★★★
The graph below shows the total accumulated dollars (in millions) spent by the Surf City government during 1988 . For example, about 0.5 million had been spent by the beginning of February and approximately 2 million by the end of April. Approximately how many millions of dollars were spent during the summer months of June, July, and August?
下图显示了 1988 年 Surf City 政府累计支出总额（百万美元）。例如，到二月初已支出约 0.5 百万美元，到四月底约 2 百万美元。六月、七月和八月的夏季大约支出了多少百万美元？

正确答案：B · 分值：1

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1989 AMC8 #20 · Geometry · ★★★
The figure may be folded along the lines shown to form a number cube. Three number faces come together at each corner of the cube. What is the largest sum of three numbers whose faces come together at a corner?
此图可以沿所示线条折叠形成一个数字正方体。正方体的每个角上有三个数字面汇聚在一起。汇聚于一个角的三个数字之和最大是多少？

正确答案：D · 分值：1

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1989 AMC8 #21 · Algebra · ★★★
Jack had a bag of 128 apples. He sold 25% of them to Jill. Next he sold 25% of those remaining to June. Of those apples still in his bag, he gave the shiniest one to his teacher. How many apples did Jack have then?
Jack 有一袋 128 个苹果。他将其中的 25% 卖给了 Jill。接着他将剩下苹果中的 25% 卖给了 June。然后从袋中剩下的苹果中，他把最亮的那一个送给了老师。那时 Jack 还有多少个苹果？

正确答案：D · 分值：1

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1989 AMC8 #22 · Number Theory · ★★★★
The digits 1, 9, 8, 9 are "cycled" separately as shown and put together in a numbered list. What is the 7th7\text{th} number in the list?
数字 1、9、8、9 分别如图所示"循环"排列，并合在一起形成一个编号列表。列表中的第 7 个数是什么？

正确答案：C · 分值：1

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1989 AMC8 #23 · Geometry · ★★★
An artist has 14 cubes, each with an edge of 1 meter. She stands them on the ground to form a sculpture as shown. She then paints the exposed surface of the sculpture. How many square meters does she paint?
一位艺术家有 14 个棱长为 1 米的正方体。她将它们立在地上形成如图所示的雕塑。然后她对雕塑的暴露表面进行涂漆。她涂了多少平方米？

正确答案：C · 分值：1

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1989 AMC8 #24 · Geometry · ★★★★
Suppose a square piece of paper is folded in half vertically. The folded paper is then cut in half along the dashed line. Three rectangles are formed-a large one and two small ones. What is the ratio of the perimeter of one of the small rectangles to the perimeter of the large rectangle?
假设一张正方形纸被垂直对折。折叠后的纸再沿虚线切成两半。形成三个矩形——一个大矩形和两个小矩形。一个小矩形的周长与大矩形的周长之比是多少？

正确答案：E · 分值：1

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1989 AMC8 #25 · Counting, Probability & Statistics · ★★★★
Every time these two wheels are spun, two numbers are selected by the pointers. What is the probability that the sum of the two selected numbers is even?
每次转动这两个转盘时，指针各选中一个数字。两个选中数字之和为偶数的概率是多少？

正确答案：C · 分值：1

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