Team round 1This round will last for approximately 90 minutes – there is no break!

There are 16 questions of varying difficulty.

Each question has a time limit in which to complete it.

For each question that is answered fully you get 10 marks.

(Note: Some questions have more than one part to the answer so it may be possible to gain some of the marks if you don’t answer the whole question)

Only answers are required – it is not necessary to show any working out.

Once the time limit is up you must hand in the correct piece of white paper with the answer filled in where indicated.

You have 17 answer sheets – one for each question and one for the trial question.

Each answer sheet also gives the question number and your team name.

Each team also has 6 sheets of pink paper - each is an opportunity to gain bonus marks.

If you have answered a question within the first 90 seconds you can write your answer on the pink paper and then hold this paper up to be collected.

If you have answered the question correctly you will gain bonus marks equal to the time limit allowed for that question.

But remember – you only have six of these attempts for bonus marks.

A whistle will be blown after 90 seconds to indicate that no more bonus answers will be accepted.

IMPORTANT:You MUST write down the question number on your

pink sheet.

Are there any questions?

Trial question – You have 2 minutes for

this question.DO NOT use a bonus sheet.

You now have 30 seconds left 10987654321

Trial question.

Ali is thinking of a whole number. When her number is divided by 99, the remainder is 8. What is the remainder when Ali’s number is divided by 9?

We will now start the actual questions.

Remember - bonus marks if you submit a correct answer on the pink sheet within 90 seconds.

You have 4 minutes forquestion 1.

You now have 30 seconds left 10987654321STOP

Question 1(4 minutes)

If x2 + xy + y2 = 7 and

x + y = 2

What is the value of xy?

Please hand in your answer.

You have 7 minutes forquestion 2.

You now have 30 seconds left 10987654321STOP

Question 2(7 minutes)

It can be proven that there are exactly three integral values of x

for which4x + 41993 + 41996

is a perfect square (i.e. the square of an integer.)

What are these three values of x?

Please hand in your answer.

You have 6 minutes forquestion 3.

You now have 30 seconds left 10987654321STOP

Question 3(6 minutes)

What is the least integer n > 1 for which , and are all

integers?n 3 n 4 n

Please hand in your answer.

You have 5 minutes forquestion 4.

You now have 30 seconds left 10987654321STOP

Question 4 (5 minutes)A regular hexagon whose perimeter is 12 can be inscribed in a certain rectangle, as shown. What is the

area of the rectangle?

Please hand in your answer.

You have 5 minutes forquestion 5.

You now have 30 seconds left 10987654321STOP

Question 5 (5 minutes)

After my 16-digit credit card number was written below, some of the digits

were erased. If the sum of the digits in any four consecutive boxes was 24, what was the sum of the seven digits

between the two 9’s shown?91 9 7

Please hand in your answer.

You have 4 minutes forquestion 6.

You now have 30 seconds left 10987654321STOP

Question 6(4 minutes)

What is the value of p for which

is p% of ?3

86

Please hand in your answer.

You have 6 minutes forquestion 7.

You now have 30 seconds left 10987654321STOP

Question 7(6 minutes)

The line 2y − 3x = 12 intersects the x-axis at A and the y-axis at B. For what value of k > 0 will a

line through B intersect thex-axis at C(k, 0) so that the

area of ABC is 21?

Please hand in your answer.

You have 7 minutes forquestion 8.

You now have 30 seconds left 10987654321STOP

Question 8 (7 minutes)

At 6 o’clock, the tip of a clock’s hour hand was 23 cm from the tip of its minute hand. At 9 o’clock, this distance was only 17 cm.

By how many cm does the minute hand’s length exceed the hour hand’s length?

Please hand in your answer.

You have 6 minutes forquestion 9.

You now have 30 seconds left 10987654321STOP

Question 9(6 minutes)

What are all the values of x that satisfy

2 3 2 3?x x x

Please hand in your answer.

You have 5 minutes forquestion 10.

You now have 30 seconds left 10987654321STOP

Question 10(5 minutes)

When choosing from a list of four different whole numbers, I can select three whose product is 74, and you can select three

whose product is 54. What is the product of all four

numbers?

Please hand in your answer.

You have 6 minutes forquestion 11.

You now have 30 seconds left 10987654321STOP

Question 11(6 minutes)

Three solid gold spherical balls, with diameters of 3, 4, and 5

respectively, are melted down and made into a single solid gold

spherical ball of diameter d. What is the value of d?

Please hand in your answer.

You have 7 minutes forQuestion 12.

You now have 30 seconds left 10987654321STOP

Question 12(7 minutes)

At a classroom costume party, the average age of the b boys is g, and the average age of the g girls is b. If the average age of everyone at the party (all the boys and girls, plus their 42-year-old teacher) is b + g, what is this value of b + g?

Please hand in your answer.

You have 6 minutes forQuestion 13.

You now have 30 seconds left 10987654321STOP

Question 13(6 minutes)

If

What is the value of

1 1 1

( 1) ( 1) ( 1)( 1)a b b a a b

1 1?

a b

Please hand in your answer.

You have 5 minutes forquestion 14.

You now have 30 seconds left 10987654321STOP

Question 14(5 minutes)

Between 1 and 200 there is a sequence of 13 consecutive integers, none of which is a

prime.

What is the smallest of these integers?

Please hand in your answer.

You have 7 minutes forQuestion 15.

You now have 30 seconds left 10987654321STOP

Question 15 (7 minutes)

Since 1987, the population of Megalopolis has increased by 10%, while the number of taxicabs has decreased by 12%. By what per cent should the present number of taxicabs be increased to restore, to its 1987 level, the ratio of the population to the number of taxicabs?

Please hand in your answer.

You have 4 minutes forquestion 16.

This is the last question!!!

You now have 30 seconds left 10987654321STOP

Question 16(4 minutes)

What are the coordinates of the point on the graph of x2 + y2 = 1

that is nearest to (3, 4)?

Please hand in your answer.

…this is...

THE END

Time to breathe a sigh of relief,eat some lunch and unwind.

Try not to destroy the universeOn your way out!!!