The Southeast Asia Mathematical Olympiad (SEAMO) is an international Math Olympiad competition that originated in Singapore and was founded by Mr. Terry Chew in 2016 in 8 Southeast Asian Countries. Since then, it is growing its popularity around the world. In 2019 it was recognized by 18 countries. In 2020 total number of participating countries increased to 22, including students from Indonesia, Brazil, China, Newzealand, and Taiwan students enrolled in SEAMO 2022-23.

**Problem and Solution SEAMO 2017 paper A**. Soal ini bersumber dari seamo-official.org

1. What is the mass of the Ball B?

(A) 20 g

(B) 30 g

(C) 40 g

(D) 50 g

(E) None of the above

2. Find the sum of

\(3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19\)

(A) 77

(B) 88

(C) 99

(D) 110

(E) None of the above

3. What number does \(⊡\) represent?

\(⊡+⊙ = 12\)

\(⊙ ×6 = 42\)

(A) 3

(B) 5

(C) 7

(D) 9

(E) None of the above

4. Shawn stays on the \(8^{th}\) floor. He takes 1 minute to walk from the \(1^{st}\) to the \(2^{nd}\) floor. How many minutes does he take to walk from the \(1^{st}\) to the \(8^{th}\) floor?

(A) 5

(B) 6

(C) 7

(D) 8

(E) None of the above

5. John is cutting a cake. What is the maximum number of pieces he can get with 3 cuts?

(A) 5

(B) 6

(C) 7

(D) 8

(E) None of the above

6. There are 60 minutes in an hour. By observing the two clocks, how many minutes has pass passed?

(A) 135 min

(B) 140 min

(C) 145 min

(D) 150 min

(E) None of the above

7. Which of the following can be traced, without drawing over any line twice, and without lifting your pen?

(A) Figure 1 only

(B) Figures 1 and 2

(C) Figures 1 and 3

(D) Figure 2 only

(E) Figures 2 and 3

8. At least how many cubes are there in the figure below?

(A) 9

(B) 10

(C) 11

(D) 12

(E) None of the above

9. There were 31 commuters on the bus. At the 1st stop, 17 alighted and 14

boarded. At the 2nd stop, 5 alighted and 3 boarded. How many commuters are there now?

(A) 25

(B) 26

(C) 27

(D) 28

(E) None of the above

10. 20 children were queuing to buy food.

Ali was 8th from the front.

Emma was 6th from the back.

How many children were queuing between Ali and Emma?

(A) 3

(B) 4

(C) 5

(D) 6

(E) None of the above