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[email protected]Mathematics Essay Problems
Country: Name: ID: Score:
Instructions:
• Write down your name and country on every page.
• You have 90 minutes to work on this test.
• Write down your detail solutions or working process in English on the space below the question.
• Each problem is worth 3 points, and partial credit may be awarded.
• Use black or blue colour pen or pencil to write your answer.
“Smart, Skilled, and Creative In a Joyful Competition for Excellence”
The following table is for jury use only.
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Total Score
Score Score Score
ESSAY PROBLEMS
Country: Name: ID:
1. Write the numbers 1, 2, 3, ..., 9 on the circumference of a circle in such a way that no two neighboring numbers would give a sum that is divisible by either 3 or 5 or 7.
ANSWER:
ESSAY PROBLEMS
Country: Name: ID:
2. Suppose that the sum of n consecutive integers (included positive integers, 0 and negative integers) is 55, find the largest value of n.
ANSWER:
ESSAY PROBLEMS
Country: Name: ID:
3. Let a, b and c be digits. The product of the three-digit numbers abc, bca and cab is a nine-digit number whose first digit is 2 and whose last digit is 9.
Find this product.
ANSWER:
ESSAY PROBLEMS
Country: Name: ID:
4. The shape of a factory is a rectangle PQRS with PS =44m and RS =40m.
The factory is divided in to 5 rooms, I, II, III, IV and V, as shown in the figure below. The perimeters of room II, III and IV are equal. If room I with III form a square, and room V with room III also form a square, what is the sum of the perimeters of room I and V, in m?
ANSWER: m
S
Q R
P I
III IV V
II
ESSAY PROBLEMS
Country: Name: ID:
5. The number abcab is a multiple of 7, abc a multiple of 9 and cba a multiple of 4. Find the smallest value for a b c× × .
ANSWER:
ESSAY PROBLEMS
Country: Name: ID:
6. In △ABC, point M is the midpoint of BC, AM =CM , 56∠ATC= °, and AT bisects ∠BAC, as shown in the figure below. What is the size of ∠AMB, in degrees?
ANSWER:______________________
56°
T M
C B
A
°
ESSAY PROBLEMS
Country: Name: ID:
7. A group of students went on a field trip by bus. Each bus held the same number of students, each seat was filled, and everyone had a seat. But on the way, one bus broke down. The students were distributed evenly among the remaining buses, and in each bus 4 students had to stand. On the way home, two more buses broke down, and so they finished the trip with 18 students standing in each bus. How many students were on this trip?
ANSWER: students
ESSAY PROBLEMS
Country: Name: ID:
8. In the figure below, ABCD and CEFG are parallelograms so that BCG is a straight line, and ∠ADE =115°. If EG=FG, find the values of m+ +n p.
ANSWER:
115°
D E
B C A
G
F
m°
p° n°
ESSAY PROBLEMS
Country: Name: ID:
9. How many different four-digit numbers are there with the sum of its digits is 9 such that the digit 0 is not included?
ANSWER: four-digit numbers
ESSAY PROBLEMS
Country: Name: ID:
10. Using 6 given colors, you color each side of a cube to a different color, then you write the six numbers on it so that the numbers 6 and 1; 2 and 5; 3 and 4 are facing each other. How many different cubes can you make? (Two cubes are considered to be the same if you can rotate one cube into the position of the other.)
ANSWER:
ESSAY PROBLEMS
Country: Name: ID:
11. The diagram below shows a sequence of towers made from toothpicks. How many toothpicks will the 10th tower require?
ANSWER: toothpicks
1st 2nd 3rd 4th
ESSAY PROBLEMS
Country: Name: ID:
12. The two-digit number ab and the number ab+45 are said to be similar if the sum of the digits of ab is the same as the sum of the digits of ab+45. For example : 15 and 15+45=60 are similar because the sum of the digits of each number is 6. How many pairs of similar numbers are there?
ANSWER: pairs
ESSAY PROBLEMS
Country: Name: ID:
13. In how many ways can three different numbers be selected from the numbers 1 to 15, so that their sum is a multiple of 4?
ANSWER: ways
