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 B**. Soal ini bersumber dari seamo-official.org

1. Find the missing number in

\(2, 2, 4, 6, 10, (\;\;\; ), 42,…\)

(A) 12

(B) 14

(C) 16

(D) 18

(E) None of the above

2. Cindy scored the following for five tests:

\(97, 99, 96, 93 , 95\)

What is her average score?

(A) 96

(B) 95

(C) 94

(D) 93

(E) None of the above

3. There are 15 children at a party. Each boy gets 2 balloons, while each girl

gets 3 balloons. Altogether, 37 balloons are given out. How many boys are there?

(A) 7

(B) 8

(C) 9

(D) 10

(E) None of the above

4. Which figure best replaces the question mark?

(A)

(B)

(C)

(D)

(E) None of the above

5. How many triangles are there in the figure?

(A) 12

(B) 13

(C) 14

(D) 15

(E) None of the above

6. The area of a square is given as

\(side × side\)

For example,

in the figure below, the area of the square is

\(3 cm × 3 cm = 9 cm^2\)

Find the area of square \(ABCD\) if the area of the shaded region is \(16 cm^2\).

(A) 26 cm²

(B) 29 cm²

(C) 30 cm²

(D) 32 cm²

(E) None of the above

7. Given that

and

Then,

(A) 8

(B) 10

(C) 12

(D) 14

(E) None of the above

8. Shawn is 9 years old. He asks his cousin for her age. She replies, “When you

reach my age, I will be 35 years old.” How old is Shawn’s cousin?

(A) 21

(B) 22

(C) 23

(D) 24

(E) None of the above

9. What number does AB represent?

(A) 12

(B) 21

(C) 31

(D) 32

(E) None of the above

10. Chandni and his sister were 250 m apart in the park. They began walking towards each other at a speed of 25 and 30 metres per minutes, respectively. How far apart were they after 4 minutes?

(A) 20 m

(B) 25 m

(C) 30 m

(D) 35 m

(E) None of the above