
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
International Mathematical Olympiad National Selection Test 
Malaysia 2020 Round 1 Primary
Time: 2.5 hours <details><summary>Rules</summary>$\bullet$  For each problem you have to submit the answer only. The answer to each problem is a non-negative integer. $\bullet$  No mark is deducted for a wrong answer. $\bullet$  The maximum number of points is (1 + 2 + 3 + 4) x 5 = 50 points.</details>**Part A** (1 point each)

p1. Annie asks his brother four questions, "What is  $20$  plus  $20$ ? What is  $20$  minus  $20$ ? What is  $20$  times  $20$ ? What is  $20$  divided by  $20$ ?". His brother adds the answers to these four questions, and then takes the (positive) square root of the result. What number does he get?

p2. A broken watch moves slower than a regular watch. In every  $7$  hours, the broken watch lags behind a regular watch by  $10$  minutes. In one week, how many hours does the broken watch lags behind a regular watch?

p3. Given a square  $ABCD$ . A point  $P$  is chosen outside the square so that triangle  $BCP$  is equilateral. Find  $\angle APC$ , in degrees.

p4. Hussein throws 4 dice simultaneously, and then adds the number of dots facing up on all  $4$  dice. How many possible sums can Hussein get?

Note: For example, he can get sum  $14$ , by throwing  $4$ ,  $6$ ,  $3$ , and  $ 1$ . Assume these are regular dice, with  $1$  to  $6$  dots on the faces.

p5. Mrs. Sheila says, "I have  $5$  children. They were born one by one every  $3$  years. The age of my oldest child is  $7$  times the age of my youngest child." What is the age of her third child?**Part B**(2 points each)


p6. The number  $N$  is the smallest positive integer with the sum of its digits equal to  $2020$ . What is the first (leftmost) digit of  $N$ ?


p7. At a food stall, the price of  $16$  banana fritters is  $k$  RM , and the price of  $k$  banana fritters is  $ 1$  RM . What is the price of one banana fritter, in sen?

Note:  $1$  RM is equal to  $100$  sen.


p8. Given a trapezium  $ABCD$  with  $AD \parallel$  to  $BC$ , and  $\angle A = \angle B = 90^o$ . It is known that the area of the trapezium is 3 times the area of  $\vartriangle ABD$ . Find  $$ \frac{area \,\, of \,\, \vartriangle ABC}{area \,\, of \,\, \vartriangle ABD}. $$  p9. Each  $\vartriangle$  symbol in the expression below can be substituted either with  $+$  or  $-$ :  $$ \vartriangle 1 \vartriangle 2 \vartriangle 3 \vartriangle 4. $$  How many possible values are there for the resulting arithmetic expression?

Note: One possible value is  $-2$ , which equals  $-1 - 2 - 3 + 4$ .


p10. How many  $3$ -digit numbers have its sum of digits equal to  $4$ ?**Part C** (3 points each)


p11. Find the value of  $$ +1 + 2 + 3 - 4 - 5 - 6 + 7 + 8 + 9 - 10 - 11 - 12 +... - 2020 $$  where the sign alternates between  $+$  and  $-$  after every three numbers.


p12. If Natalie cuts a round pizza with  $4$  straight cuts, what is the maximum number of pieces that she can get?

Note: Assume that all the cuts are vertical (perpendicular to the surface of the pizza). She cannot move the pizza pieces until she finishes cutting.


p13. Given a square with area  $ A$ . A circle lies inside the square, such that the circle touches all sides of the square. Another square with area  $ B$  lies inside the circle, such that all its vertices lie on the circle. Find the value of  $A/B$ .


p14. This sequence lists the perfect squares in increasing order:  $$ 0, 1, 4, 9, 16, ... ,a, 10^8, b, ... $$  Determine the value of  $b - a$ .


p15. Determine the last digit of  $5^5 + 6^6 + 7^7 + 8^8 + 9^9$ **Part D** (4 points each)


p16. Find the sum of all integers between  $-\sqrt{1442}$  and  $\sqrt{2020}$ .


p17. Three brothers own a painting company called Tiga Abdul Enterprise. They are hired to paint a building.
Wahab says, "I can paint this building in  $3$  months if I work alone". Wahib says, "I can paint this building in  $2$  months if I work alone". Wahub says, "I can paint this building in  $k$  months if I work alone". If they work together, they can finish painting the building in  $1$  month only. What is  $k$ ?


p18. Given a rectangle  $ABCD$  with a point  $P$  inside it. It is known that  $PA = 17$ ,  $PB = 15$ , and  $PC = 6$ . What is the length of  $PD$ ?


p19. What is the smallest positive multiple of  $225$  that can be written using digits  $0$  and  $ 1$  only?


p20. Given positive integers  $a, b$ , and  $c$  with  $a + b + c = 20$ . Determine the number of possible integer values for  $\frac{a + b}{c}$ .


PS. Problems 6-20 were also used in [Juniors ](https://artofproblemsolving.com/community/c4h2675966p23194287)as 1-15. Problems 11-20 were also used in Seniors 1-10.

Present the answer in LaTex format: \boxed{Your answer}
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