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AMC 10 2003 B

Question 1

Which of the following is the same as

Solution

  
  2020-07-09 06:36:02

Question 2

Al gets the disease algebritis and must take one green pill and one pink pill each day for two weeks. A green pill costs more than a pink pill, and Al's pills cost a total of for the two weeks. How much does one green pill cost?

Solution

  
  2020-07-09 06:36:02

Question 3

The sum of consecutive even integers is less than the sum of the first consecutive odd counting numbers. What is the smallest of the even integers?

Solution

  
  2020-07-09 06:36:02

Question 4

Rose fills each of the rectangular regions of her rectangular flower bed with a different type of flower. The lengths, in feet, of the rectangular regions in her flower bed are as shown in the figure. She plants one flower per square foot in each region. Asters cost each, begonias each, cannas each, dahlias each, and Easter lilies each. What is the least possible cost, in dollars, for her garden?

Solution

  
  2020-07-09 06:36:02

Question 5

Moe uses a mower to cut his rectangular -foot by -foot lawn. The swath he cuts is inches wide, but he overlaps each cut by inches to make sure that no grass is missed. He walks at the rate of feet per hour while pushing the mower. Which of the following is closest to the number of hours it will take Moe to mow the lawn?

Solution

  
  2020-07-09 06:36:02

Question 6

Many television screens are rectangles that are measured by the length of their diagonals. The ratio of the horizontal length to the height in a standard television screen is . The horizontal length of a "-inch" television screen is closest, in inches, to which of the following?

Solution

  
  2020-07-09 06:36:02

Question 7

The symbolism denotes the largest integer not exceeding . For example, and . Compute

Solution

  
  2020-07-09 06:36:02

Question 8

The second and fourth terms of a geometric sequence are and . Which of the following is a possible first term?

Solution

  
  2020-07-09 06:36:02

Question 9

Find the value of that satisfies the equation

Solution

  
  2020-07-09 06:36:02

Question 10

Nebraska, the home of the AMC, changed its license plate scheme. Each old license plate consisted of a letter followed by four digits. Each new license plate consists of the three letters followed by three digits. By how many times is the number of possible license plates increased?

Solution

  
  2020-07-09 06:36:02

Question 11

A line with slope intersects a line with slope at point . What is the distance between the -intercepts of these two lines?

Solution

  
  2020-07-09 06:36:02

Question 12

Al, Betty, and Clare split among them to be invested in different ways. Each begins with a different amount. At the end of one year, they have a total of . Betty and Clare have both doubled their money, whereas Al has managed to lose . What was Al's original portion?

Solution

  
  2020-07-09 06:36:02

Question 13

Let denote the sum of the digits of the positive integer . For example, and . For how many two-digit values of is ?

Solution

  
  2020-07-09 06:36:02

Question 14

Given that where both and are positive integers, find the smallest possible value for .

Solution

  
  2020-07-09 06:36:02

Question 15

There are players in a single tennis tournament. The tournament is single elimination, meaning that a player who loses a match is eliminated. In the first round, the strongest players are given a bye, and the remaining players are paired off to play. After each round, the remaining players play in the next round. The tournament continues until only one player remains unbeaten. The total number of matches played is

Solution

99 players need to be eliminated in this tournament. Since it is a single elimination, we will need exactly 99 matches to eliminate 99 players to get the winner. So the answer is any description that fits 99.
  
  2017-01-03 03:27:01

Question 16

A restaurant offers three desserts, and exactly twice as many appetizers as main courses. A dinner consists of an appetizer, a main course, and a dessert. What is the least number of main courses that a restaurant should offer so that a customer could have a different dinner each night in the year ?

Solution

  
  2020-07-09 06:36:02

Question 17

An ice cream cone consists of a sphere of vanilla ice cream and a right circular cone that has the same diameter as the sphere. If the ice cream melts, it will exactly fill the cone. Assume that the melted ice cream occupies of the volume of the frozen ice cream. What is the ratio of the cone's height to its radius? (Note: a cone with radius and height has volume and a sphere with radius has volume .)

Solution

  
  2020-07-09 06:36:02

Question 18

What is the largest integer that is a divisor of for all positive even integers ?

Solution

  
  2020-07-09 06:36:02

Question 19

Three semicircles of radius are constructed on diameter of a semicircle of radius . The centers of the small semicircles divide into four line segments of equal length, as shown. What is the area of the shaded region that lies within the large semicircle but outside the smaller semicircles?

Solution

Draw the 4 lines as in the diagram. You will see that we have 3 sectors and 2 equilateral triangles with side length 1. Of the 3 sectors: all of them have radius 1; 2 of them are 120/360 of a complete circle, and 1 of them is 60/360 of a complete circle. So in total the 3 sectors are 300/360 of a complete circle with radius 1. You just need to caclulate the area of the 300/360 circle, plus the area of the 2 equilateral triangles, and then subtract from the area of the large semi-circle.
  
  2017-03-26 13:07:27

Question 20

In rectangle and . Points and are on so that and . Lines and intersect at . Find the area of .

Solution

  
  2020-07-09 06:36:02

Question 21

A bag contains two red beads and two green beads. You reach into the bag and pull out a bead, replacing it with a red bead regardless of the color you pulled out. What is the probability that all beads in the bag are red after three such replacements?

Solution

  
  2020-07-09 06:36:02

Question 22

A clock chimes once at minutes past each hour and chimes on the hour according to the hour. For example, at there is one chime and at noon and midnight there are twelve chimes. Starting at on on what date will the chime occur?

Solution

First, find how many chimes will have already happened before midnight (the beginning of the day) of February 27, 2003. 13 half-hours have passed, and the number of chimes according to the hour is 1+2+3+...+12=78. The total number of chimes is 13+78=91

Every day, there will be 24 half-hours and 2(1+2+3+...+12) = 180 chimes according to the arrow, resulting in 24+156=180 total chimes.

On February 27, the number of chimes that still need to occur is 2003-91=1912. 1912 / 180=10 R 112. Rounding up, it is 11 days past February 27, which is March 9. (In year 2003, Feb. has 28 days).
  
  2017-03-12 15:42:51

Question 23

A regular octagon has an area of one square unit. What is the area of the rectangle ?

Solution

  
  2020-07-09 06:36:02

Question 24

The first four terms in an arithmetic sequence are and in that order. What is the ???fth term?

Solution

  
  2020-07-09 06:36:02

Question 25

How many distinct four-digit numbers are divisible by and have as their last two digits?

Solution

  
  2020-07-09 06:36:02

Answer Keys


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