2014 AMC 8 真题与答案解析

2014 AMC 8 真题

答案解析请参考文末

Problem 1

Harry and Terry are each told to calculate 2014 AMC 8 Problems. Harry gets the correct answer. Terry ignores the parentheses and calculates 2014 AMC 8 Problems. If Harry's answer is 2014 AMC 8 Problems and Terry's answer is 2014 AMC 8 Problems, what is 2014 AMC 8 Problems?

2014 AMC 8 Problems

 

Problem 2

Paul owes Paula 35 cents and has a pocket full of 5-cent coins, 10-cent coins, and 25-cent coins that he can use to pay her. What is the difference between the largest and the smallest number of coins he can use to pay her?

2014 AMC 8 Problems

 

Problem 3

Isabella had a week to read a book for a school assignment. She read an average of 36 pages per day for the first three days and an average of 44 pages per day for the next three days. She then finished the book by reading 10 pages on the last day. How many pages were in the book?

2014 AMC 8 Problems

 

Problem 4

The sum of two prime numbers is 85. What is the product of these two prime numbers?

2014 AMC 8 Problems

 

Problem 5

Margie's car can go 32 miles on a gallon of gas, and gas currently costs $4 per gallon. How many miles can Margie drive on $20 worth of gas?

2014 AMC 8 Problems

 

Problem 6

Six rectangles each with a common base width of 2 have lengths of 1, 4, 9, 16, 25, and 36. What is the sum of the areas of the six rectangles?

2014 AMC 8 Problems

 

Problem 7

There are four more girls than boys in Ms. Raub's class of 28 students. What is the ratio of number of girls to the number of boys in her class?

2014 AMC 8 Problems

 

Problem 8

Eleven members of the Middle School Math Club each paid the same amount for a guest speaker to talk about problem solving at their math club meeting. In all, they paid their guest speaker 2014 AMC 8 Problems. What is the missing digit A of this 3-digit number?

2014 AMC 8 Problems

 

Problem 9

In 2014 AMC 8 Problems, 2014 AMC 8 Problems is a point on side 2014 AMC 8 Problems such that 2014 AMC 8 Problems and 2014 AMC 8 Problems measures 2014 AMC 8 Problems. What is the degree measure of 2014 AMC 8 Problems?

2014 AMC 8 Problems

2014 AMC 8 Problems

 

Problem 10

The first AMC 8 was given in 1985 and it has been given annually since that time. Samantha turned 12 years old the year that she took the seventh AMC 8. In what year was Samantha born?

2014 AMC 8 Problems

 

Problem 11

Jack wants to bike from his house to Jill's house, which is located three blocks east and two blocks north of Jack's house. After biking each block, Jack can continue either east or north, but he needs to avoid a dangerous intersection one block east and one block north of his house. In how many ways can he reach Jill's house by biking a total of five blocks?

2014 AMC 8 Problems

 

Problem 12

A magazine printed photos of three celebrities along with three photos of the celebrities as babies. The baby pictures did not identify the celebrities. Readers were asked to match each celebrity with the correct baby pictures. What is the probability that a reader guessing at random will match all three correctly?

2014 AMC 8 Problems

 

Problem 13

If 2014 AMC 8 Problems and 2014 AMC 8 Problems are integers and 2014 AMC 8 Problems is even, which of the following is impossible?

2014 AMC 8 Problems and 2014 AMC 8 Problems are even 2014 AMC 8 Problems and 2014 AMC 8 Problems are odd 2014 AMC 8 Problems is even 2014 AMC 8 Problems is odd 2014 AMC 8 Problems none of these are impossible

 

Problem 14

Rectangle ABCD and right triangle DCE have the same area. They are joined to form a trapezoid, as shown. What is DE?

2014 AMC 8 Problems

2014 AMC 8 Problems

 

Problem 15

The circumference of the circle with center 2014 AMC 8 Problems is divided into 12 equal arcs, marked the letters 2014 AMC 8 Problems through 2014 AMC 8 Problems as seen below. What is the number of degrees in the sum of the angles 2014 AMC 8 Problems and 2014 AMC 8 Problems? 2014 AMC 8 Problems

2014 AMC 8 Problems

 

Problem 16

The "Middle School Eight" basketball conference has 8 teams. Every season, each team plays every other conference team twice (home and away), and each team also plays 4 games against non-conference opponents. What is the total number of games in a season involving the "Middle School Eight" teams?

2014 AMC 8 Problems

 

Problem 17

George walks 2014 AMC 8 Problems mile to school. He leaves home at the same time each day, walks at a steady speed of 2014 AMC 8 Problems miles per hour, and arrives just as school begins. Today he was distracted by the pleasant weather and walked the first 2014 AMC 8 Problems mile at a speed of only 2014 AMC 8 Problems miles per hour. At how many miles per hour must George run the last 2014 AMC 8 Problems mile in order to arrive just as school begins today?

2014 AMC 8 Problems

 

Problem 18

Four children were born at City Hospital yesterday. Assume each child is equally likely to be a boy or a girl. Which of the following outcomes is most likely?

2014 AMC 8 Problems all 4 are boys 2014 AMC 8 Problems all 4 are girls 2014 AMC 8 Problems 2 are girls and 2 are boys 2014 AMC 8 Problems 3 are of one gender and 1 is of the other gender 2014 AMC 8 Problems all of these outcomes are equally likely

 

Problem 19

A cube with 3-inch edges is to be constructed from 27 smaller cubes with 1-inch edges. Twenty-one of the cubes are colored red and 6 are colored white. If the 3-inch cube is constructed to have the smallest possible white surface area showing, what fraction of the surface area is white?

2014 AMC 8 Problems

 

Problem 20

Rectangle ABCD has sides CD=3 and DA=5. A circle of radius 1 is centered at A, a circle of radius 2 is centered at B, and a circle of radius 3 is centered at C. Which of the following is closest to the area of the region inside the rectangle but outside all three circles?

2014 AMC 8 Problems

2014 AMC 8 Problems

 

Problem 21

The 7-digit numbers 2014 AMC 8 Problems and 2014 AMC 8 Problems are each multiples of 3. Which of the following could be the value of 2014 AMC 8 Problems?

2014 AMC 8 Problems

 

Problem 22

A 2-digit number is such that the product of the digits plus the sum of the digits is equal to the number. What is the units digit of the number?

2014 AMC 8 Problems

 

Problem 23

Three members of the Euclid Middle School girls' softball team had the following conversation.

Ashley: I just realized that our uniform numbers are all 2-digit primes.

Bethany: And the sum of your two uniform numbers is the date of my birthday earlier this month.

Caitlin: That's funny. The sum of your two uniform numbers is the date of my birthday later this month.

Ashley: And the sum of your two uniform numbers is today's date.

What number does Caitlin wear?

2014 AMC 8 Problems

 

Problem 24

One day the Beverage Barn sold 252 cans of soda to 100 customers, and every customer bought at least one can of soda. What is the maximum possible median number of cans of soda bought per customer on that day?

2014 AMC 8 Problems

 

Problem 25

A straight one-mile stretch of highway, 40 feet wide, is closed. Robert rides his bike on a path composed of semicircles as shown. If he rides at 5 miles per hour, how many hours will it take to cover the one-mile stretch?

Note: 1 mile= 5280 feet 2014 AMC 8 Problems

2014 AMC 8 Problems

 

 

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