2022 Fryer Contest
(Grade 9)
Tuesday, April 12, 2022
(in North America and South America)
Wednesday, April 13, 2022
(outside of North American and South America)
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©2022 University of Waterloo
Instructions
Time: 75 minutes
Number of Questions: 4
Each question is worth 10 marks.
Calculating devices are allowed, provided that they do not have any of the following features: (i) internet access, (ii) the ability to communicate with other devices, (iii) information previously stored by students (such as formulas, programs, notes, etc.), (iv) a computer algebra system, (v) dynamic geometry software.
Parts of each question can be of two types:
- SHORT ANSWER parts indicated by
- worth 2 or 3 marks each
- full marks are given for a correct answer which is placed in the box
- part marks are awarded if relevant work is shown in the space provided
- FULL SOLUTION parts indicated by
- worth the remainder of the 10 marks for the question
- must be written in the appropriate location in the answer booklet
- marks awarded for completeness, clarity, and style of presentation
- a correct solution poorly presented will not earn full marks
WRITE ALL ANSWERS IN THE ANSWER BOOKLET PROVIDED.
- Extra paper for your finished solutions supplied by your supervising teacher must be
inserted into your answer booklet. Write your name, school name, and question number
on any inserted pages.
- Express answers as simplified exact numbers except where otherwise indicated. For example, and are simplified exact numbers.
Do not discuss the problems or solutions from this contest online for the next 48 hours.
The name, grade, school and location, and score range of some top-scoring students will be
published on our website, cemc.uwaterloo.ca. In addition, the name, grade, school and location,
and score of some top-scoring students may be shared with other mathematical organizations
for other recognition opportunities.
NOTE:
- Please read the instructions for the contest.
- Write all answers in the answer booklet provided.
- For questions marked
, place your answer in the appropriate box in the answer booklet and show your work.
- For questions marked
, provide a well-organized solution in the answer booklet. Use mathematical statements and words to explain all of the steps of your solution. Work out some details in rough on a separate piece of paper before writing your finished solution.
- Diagrams are not drawn to scale. They are intended as aids only.
- While calculators may be used for numerical calculations, other mathematical steps must
be shown and justified in your written solutions, and specific marks may be allocated for
these steps. For example, while your calculator might be able to find the -intercepts of the graph of an equation like , you should show the algebraic steps that you used to find these numbers, rather than simply writing these numbers down.
Questions
In a game, a player throws a ball at a target. If they hit the
target, then 7 points are added to their score. If they miss the target,
then points are subtracted from
their score. A player’s score begins at 0, and it is possible for a
player to have a negative score.
What is Shane’s score after throws if of the throws are hits and 2 of the
throws are misses?
After exactly hits and 6 misses, Susan’s score is 59.
What is the value of ?
After exactly throws, Souresh’s score is greater
than 85 and less than 105. If exactly of these throws are misses, determine
all possible values of the positive integer .
-
Two identical rectangles, and , each with area 13 cm, overlap as shown.
The area of the
overlapped region, rectangle ,
is 5 cm. What is the area of
rectangle ?
Two identical right-angled triangles,
and , overlap along side , as shown.
Sides and intersect at . The area of the overlapped region,
, is equal to half of
the area of . The area
of the figure is . If cm, determine the length of .
Rectangle and overlap so that lies on , and intersects at , as shown.
The area of rectangle is 108 cm, and the area of is 81 cm. If the area of the figure is 117 cm, determine the area of the overlapped
region, .
If an integer is written
as a product of prime numbers, this product (known as its prime
factorization) can be used to determine the number of positive
factors of . For example, the
prime factorization of . The positive factors of 28 are: Each positive factor includes ,
or twos, or sevens, and no other prime numbers.
Since there are 3 choices for the number of twos, and 2 choices for the
number of sevens, there are positive factors of .
How many positive factors does have?
A positive integer has the positive factors , , , and and exactly fourteen other positive
factors. Determine the value of .
Determine the number of positive integers
less than that have the
positive factors and and exactly ten other positive
factors.
Franco and Sarah play a game four times using the following
rules:
(R1) The game starts with two jars, each of which might contain
some beans.
(R2)Franco goes first, Sarah goes second and they continue to
alternate turns.
(R3) On each turn, the player removes a pre-determined number of
beans from one of the jars. If neither jar has enough beans in it, the
player cannot take their turn and loses. If only one jar has enough
beans in it, the player must remove beans from that jar. If both jars
have enough beans, the player chooses one of the jars and removes the
beans from that jar.
(R4) Franco must attempt to remove 1 bean on his first turn, 3
beans on his second turn, and 4 beans on his third turn. On each of his
following sets of three turns, Franco must continue to attempt to remove
1, 3 and 4 beans in sequence.
(R5) Sarah must attempt to remove 2 beans on her first turn and 5
beans on her second turn. On each of her following sets of two turns,
Sarah must continue to attempt to remove 2 and 5 beans in
sequence.
(R6) A player is declared the winner if the other player loses,
as described in (R3).
For example, if the game begins with 10 beans in one jar and 10 beans
in the other jar, the sequence of play could be:
Turn Number |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
Number of beans removed by Franco |
1 |
|
3 |
|
4 |
|
1 |
Number of beans removed by Sarah |
|
2 |
|
5 |
|
2 |
|
Number of beans remaining in the
jars
| |
|
|
|
|
|
|
On the next turn, Sarah cannot remove 5 beans since the greatest
number of beans remaining in either jar is 2 and so after exactly 7
turns, Sarah loses and Franco wins.
At the beginning of the first game, there
are 40 beans in one jar and 0 beans in the other jar. After a total of
10 turns (5 turns for each of Franco and Sarah), what is the total
number of beans left in the two jars?
At the beginning of the second game,
there are 384 beans in one jar and 0 beans in the other jar. The game
ends with a winner after a total of exactly turns. What is the value of ?
At the beginning of the third game, there
are 17 beans in one jar and 6 beans in the other jar. There is a
winning strategy that one player can follow to guarantee that
they are the winner. Determine which player has a winning strategy and
describe this strategy. (A winning strategy is a way for a
player to choose a jar on each turn so that they win no matter the
choices of the other player.)
At the beginning of the fourth game,
there are 2023 beans in one jar and 2022 beans in the other jar.
Determine which player has a winning strategy and describe this
strategy.
Further Information
For students...
Thank you for writing the Fryer Contest!
Encourage your teacher to register you for the Canadian Intermediate Mathematics Contest or the Canadian Senior Mathematics Contest, which will be written in November.
Visit our website cemc.uwaterloo.ca to find
- Free copies of past contests
- Math Circles videos and handouts that will help you learn more mathematics and prepare for future contests
- Information about careers in and applications of mathematics and computer science
For teachers...
Visit our website cemc.uwaterloo.ca to
- Obtain information about future contests
- Look at our free online courseware for high school students
- Learn about our face-to-face workshops and our web resources
- Subscribe to our free Problem of the Week
- Investigate our online Master of Mathematics for Teachers
- Find your school's contest results