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AMC 8 1986
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Question 1

In July 1861, inches of rain fell in Cherrapunji, India. What was the average rainfall in inches per hour during that month?

Solution

  
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Question 2

Which of the following numbers has the largest reciprocal?

Solution

  
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Question 3

The smallest sum one could get by adding three different numbers from the set

is

Solution

  
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Question 4

The product

is closest to

Solution

  
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Question 5

A contest began at noon one day and ended minutes later. At what time did the contest end?

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Question 6

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Question 7

How many whole numbers are between and ?

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Question 8

In the product shown, is a digit. The value of is

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Question 9

Using only the paths and the directions shown, how many different routes are there from to ?

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Question 10

A picture feet across is hung in the center of a wall that is feet wide. How many feet from the end of the wall is the nearest edge of the picture?

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Question 11

If means , then is

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Question 12

The table below displays the grade distribution of the students in a mathematics class on the last two tests. For example, exactly one student received a 'D' on Test 1 and a 'C' on Test 2 (see circled entry). What percent of the students received the same grade on both tests?

Solution

  
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Question 13

The perimeter of the polygon shown is

Solution

  
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Question 14

If

and

, then the largest value of the quotient is

Solution

  
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Question 15

Sale prices at the Ajax Outlet Store are below original prices. On Saturdays an additional discount of off the sale price is given. What is the Saturday price of a coat whose original price is $ ? $ $ $ $ $

Solution

  
  2020-07-09 06:39:42

Question 16

A bar graph shows the number of hamburgers sold by a fast food chain each season. However, the bar indicating the number sold during the winter is covered by a smudge. If exactly of the chain's hamburgers are sold in the fall, how many million hamburgers are sold in the winter?

Solution

  
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Question 17

Let be an odd whole number and let be any whole number. Which of the following statements about the whole number is always true?

Solution

  
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Question 18

A rectangular grazing area is to be fenced off on three sides using part of a meter rock wall as the fourth side. Fence posts are to be placed every meters along the fence including the two posts where the fence meets the rock wall. What is the fewest number of posts required to fence an area m by m?

Solution

  
  2020-07-09 06:39:42

Question 19

At the beginning of a trip, the mileage odometer read miles. The driver filled the gas tank with gallons of gasoline. During the trip, the driver filled his tank again with gallons of gasoline when the odometer read . At the end of the trip, the driver filled his tank again with gallons of gasoline. The odometer read . To the nearest tenth, what was the car's average miles-per-gallon for the entire trip?

Solution

  
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Question 20

The value of the expression is closest to

Solution

  
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Question 21

Suppose one of the eight lettered identical squares is included with the four squares in the T-shaped figure outlined. How many of the resulting figures can be folded into a topless cubical box?

Solution

  
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Question 22

Alan, Beth, Carlos, and Diana were discussing their possible grades in mathematics class this grading period. Alan said, "If I get an A, then Beth will get an A." Beth said, "If I get an A, then Carlos will get an A." Carlos said, "If I get an A, then Diana will get an A." All of these statements were true, but only two of the students received an A. Which two received A's?

Solution

  
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Question 23

The large circle has diameter . The two small circles have their centers on and just touch at , the center of the large circle. If each small circle has radius , what is the value of the ratio of the area of the shaded region to the area of one of the small circles?

Solution

  
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Question 24

The students at King Middle School are divided into three groups of equal size for lunch. Each group has lunch at a different time. A computer randomly assigns each student to one of three lunch groups. The probability that three friends, Al, Bob, and Carol, will be assigned to the same lunch group is approximately

Solution

  
  2020-07-09 06:39:42

Question 25

Which of the following sets of whole numbers has the largest average?

Solution

  
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Answer Keys


Question 1: A
Question 2: A
Question 3: C
Question 4: C
Question 5: D
Question 6: E
Question 7: B
Question 8: E
Question 9: E
Question 10: B
Question 11: A
Question 12: D
Question 13: C
Question 14: C
Question 15: B
Question 16: A
Question 17: E
Question 18: B
Question 19: D
Question 20: D
Question 21: E
Question 22: C
Question 23: B
Question 24: B
Question 25: D



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