Regional questions of BD math olympiad 2017
Primary Category – Dhaka Region
1. 30, 53, 29, 32, 15, 9, 22, 47, 49, 13, 40, 33 āĻāĻ āϏāĻāĻā§āϝāĻžāĻā§āϞ⧠āĻĨā§āĻā§ āĻĻā§āĻāĻŋ āĻāϰ⧠āϏāĻāĻā§āϝāĻž āύāĻŋā§ā§ āĻŽā§āĻ ā§ŦāĻāĻŋ āĻā§ā§āĻž āĻāĻ āύ āĻāϰāĻž āĻšāϞāĨ¤ āĻāĻ āĻā§ā§āĻžāĻā§āϞā§āϰ āĻĒā§āϰāϤāĻŋāĻāĻŋāϰ āϏāĻĻāϏā§āϝ āϏāĻāĻā§āϝāĻžāĻā§āϞā§āϰ āϝā§āĻāĻĢāϞ āϏāĻŽāĻžāύāĨ¤ āĻāĻāĻāĻžāĻŦā§ āĻā§ā§āĻž āĻāĻ āύ āĻāϰāĻž āĻšāϞ⧠22 āĻāϰ āϏāĻžāĻĨā§ āĻāĻāĻ āĻā§ā§āĻžā§ āĻā§āύ āϏāĻāĻā§āϝāĻž āĻāĻŋāϞ?
30, 53, 29, 32, 15, 9, 22, 47, 49, 13, 40, 33 from these numbers 6 pairs of numbers are formed. Sum of numbers from every pair is equal. Then, which number is in the same pair with 22?
2. āĻāĻŋāϤā§āϰā§, MN, AB āĻāϰ āĻāĻĒāϰ āϞāĻŽā§āĻŦāĨ¤ āĻāϰ āĻŽāĻžāύ āĻāϤ āĻĄāĻŋāĻā§āϰā§?

In figure, MN is perpendicular to AB.Find the value of x.
3. \[ \frac{2121212121210}{1121212121211}\] āĻāĻā§āύāĻžāĻāĻļāĻāĻŋāĻā§ \[\frac{a}{b}\] āĻāĻāĻžāϰ⧠āĻĒā§āϰāĻāĻžāĻļ āĻāϰāĻž āϝāĻžā§ āϝā§āĻāĻžāύ⧠a, b āĻĻā§āĻāĻāĻŋ āϏāĻšāĻŽā§āϞāĻŋāĻ āϏāĻāĻā§āϝāĻžāĨ¤ a + b = ?
\[ \frac{2121212121210}{1121212121211}\] This fraction can be expressed in the form of \[\frac{a}{b}\] , where a, b are co-prime. Then,a + b = ?
4. āĻāĻāĻāĻŋ āĻā§āϞāĻžā§ āĻĻā§āĻāĻŋ āĻāĻžāĻāĻ āĻĻā§ā§āĻž āĻĨāĻžāĻā§ āϤāĻžāϰ āĻŽāϧā§āϝ⧠āĻĨā§āĻā§ āĻĻā§āĻŦāĻā§āύ āĻ āĻāĻāĻāĻŋ āϤā§āϞāĻž āĻšāĻŦā§āĨ¤ āĻāĻžāĻāĻ āĻĻā§āĻāĻŋāϰ āĻāĻāĻāĻŋāϤ⧠⧝ āϞā§āĻāĻž āĻĨāĻžāĻāĻŦā§ āĻāϰ āĻ āĻĒāϰāĻāĻŋāϤ⧠ā§ĢāĨ¤ āĻāĻāĻāύ āĻāĻžāĻāĻ āϤā§āϞāϞ⧠āϏā§āĻāĻŋāϤ⧠āϝāϤ āύāĻŽā§āĻŦāϰ āϞā§āĻāĻž āĻĨāĻžāĻāĻŦā§, āϏā§āĻāĻžāĻ āĻšāĻŦā§ āϤāĻžāϰ āĻĒā§ā§āύā§āĻāĨ¤ āĻāĻāĻāύ āϝāϤāĻā§āĻļāĻŋ āϤāϤ āĻĒā§ā§āύā§āĻ āύāĻŋāϤ⧠āĻĒāĻžāϰā§āĨ¤ āĻāĻ āĻā§āϞāĻžā§ āĻāĻŋāĻā§ āĻĒā§ā§āύā§āĻ āĻ āϰā§āĻāύ āĻ āϏāĻŽā§āĻāĻŦ, āϝā§āĻŽāύ ā§Ŧ, ā§§ā§ŠāĨ¤ āĻāĻ āĻā§āϞāĻžā§ āϏāϰā§āĻŦā§āĻā§āĻ āĻāϤāϤāĻŽ āĻĒā§ā§āύā§āĻ āĻĒāĻžāĻā§āĻž āĻ āϏāĻŽā§āĻāĻŦ?
From two pieces of paper you have to randomly pick one. One paper is marked with number 9 and another is marked with number 5. When you pick one paper,the number marked on it will be your point. You can get as many point as you want. But in this game some point canât be achived such as 6, 13. Which largest point canât be achived?
5. ABCD āĻŦāϰā§āĻā§āϰ āĻĒā§āϰāϤāĻŋāĻāĻŋ āĻŦāĻžāĻšā§āϰ āĻĻā§āϰā§āĻā§āϝ 12 āĻāĻāĻ āĻāĻŦāĻ O āĻāϰ āĻā§āύā§āĻĻā§āϰāĨ¤ AOEB āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞ AOF āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞā§āϰ āĻĻā§āĻŦāĻŋāĻā§āĻŖāĨ¤ BE āĻāϰ āĻĻā§āϰā§āĻā§āϝ āĻāϤ?

ABCD is a square whose sides are 12 unit each. O is the center. The area of AOEB is 2 times that of AOF. What is the length of BE?
6. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 āĻĨā§āĻā§ āĻāϤāĻāĻžāĻŦā§ āĻāĻžāϰāĻāĻŋ āϤāĻŋāύ āĻ āĻā§āĻā§āϰ āϏāĻāĻā§āϝāĻž āĻāĻŽāύāĻāĻžāĻŦā§ āĻŦāĻžāĻāĻžāĻ āĻāϰāĻž āϝāĻžāϝāĻŧ āϝā§āύ āĻāĻ āĻāĻžāϰāĻāĻŋ āϏāĻāĻā§āϝāĻžāϰ āϝā§āĻāĻĢāϞ 3 āĻĻā§āĻŦāĻžāϰāĻž āĻŦāĻŋāĻāĻžāĻā§āϝ āĻšāϝāĻŧ? āĻāĻĻāĻžāĻšāϰāĻŖ: (a, b, c, d); (b, a, c, d); âĻ âĻ āĻā§ āĻāĻāĻ āĻŦāĻŋāĻŦā§āĻāύāĻž āĻāϰāĻž āĻšāϝāĻŧāĨ¤
In how many ways four different numbers can be chosen from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 such that the sum of those four numbers is divisible by 3? Here (a, b, c, d) ; (b, a, c, d); âĻ âĻ are considered to be the same.
7. \[ \frac{7x + 1}{2}, \frac{7x + 2}{3}, \frac{7x + 3}{4}, \dots, \frac{7x + 2016}{2017}\] āϝā§āĻāĻžāύ⧠x āĻāĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āĻāĻŦāĻ \[ x \leq 299 \]āĨ¤ x -āĻāϰ āĻāĻŽāύ āĻāĻŋāĻā§ āĻŽāĻžāύ āϏāĻŽā§āĻāĻŦ āϝāĻžāϰ āĻĒā§āϰāϤāĻŋāĻāĻŋāϰ āĻāύā§āϝ āĻāĻĒāϰā§āϰ āĻĒā§āϰāϤāĻŋāĻāĻŋ āĻāĻā§āύāĻžāĻāĻļāĻā§ āĻāĻŽāύ āĻāĻā§āύāĻžāĻāĻļā§ āĻĒā§āϰāĻāĻžāĻļ āĻāϰāĻž āϝāĻžāϝāĻŧ āϝā§āĻāĻžāύ⧠āĻāϰ āĻšāϰ āĻ āϞāĻŦ āϏāĻšāĻŽā§āϞāύāĻŋāĻ āϏāĻāĻā§āϝāĻž āĻšāϝāĻŧāĨ¤ x -āĻāϰ āĻāĻŽāύ āĻāϤāĻāĻŋ āĻŽāĻžāύ āĻāĻā§?
\[ \frac{7x + 1}{2}, \frac{7x + 2}{3}, \frac{7x + 3}{4}, \dots, \frac{7x + 2016}{2017}\]
Here x is a positive integer and \[ x \leq 299 \]. For some values of x, it is possible to express these given fractions in such fractions where denominator and numerator are co-prime. How many such x is possible?
8. ABC āϏāĻŽāĻĻā§āĻŦāĻŋāĻŦāĻžāĻšā§ āϤā§āϰāĻŋāĻā§āĻā§ AB = AC āĻāĻŦāĻ \[\angle A = 100^\circ\]āĨ¤ D, AB āĻāϰ āĻāĻĒāϰ āĻāĻŽāύ āĻāĻāĻāĻŋ āĻŦāĻŋāύā§āĻĻā§ āϝā§āύ CD, \[\angle ACB\] āĻā§ āϏāĻŽāĻžāύ āĻĻā§āĻāĻāĻŋ āĻ āĻāĻļā§ āĻŦāĻŋāĻāĻā§āϤ āĻāϰā§āĨ¤ āϝāĻĻāĻŋ BC -āϰ āĻĻā§āϰā§āĻā§āϝ 2018 āĻāĻāĻ āĻšāϝāĻŧ, āϤāĻŦā§ AD + CD = ?
ABC is an isosceles triangle where AB = AC and \[\angle A = 100^\circ\]. D is a point on AB such that CD bisects \[\angle ACB\] internally. If the length of BC is 2018 units then AD + CD = ?
Primary Category – Rangpur Region
1. \[\frac{2}{10} + \frac{6}{100} + \frac{4}{1000} = ? \] āĻĻāĻļāĻŽāĻŋāĻ āϏāĻāĻā§āϝāĻžā§ āĻāϤā§āϤāϰ āĻĻāĻžāĻāĨ¤
\[\frac{2}{10} + \frac{6}{100} + \frac{4}{1000}\] = ? Write your answer in decimal.
2. āϝāĻĻāĻŋ āĻā§āĻ āϝ⧠āĻā§āϞāĻžāϏ⧠āĻāĻ āĻžāϰ āĻāĻĨāĻž āϤāĻžāϤ⧠āύāĻž āĻāĻ ā§ āϤāĻžāϰ āĻāĻĒāϰā§āϰ āĻā§āϞāĻžāϏ⧠āĻāĻ ā§ āϝāĻžā§, āϤāĻžāĻā§ āϞāĻā§āώ āĻĻā§āĻāϝāĻŧāĻž āĻŦāϞā§āĨ¤ āĻāĻžāĻŽāϰā§āϞ, āϤā§āώāĻžāϰ, āϏāĻžāĻāĻžāϞ, āĻā§āĻŦāĻžā§ā§āϰ āĻāĻžāϰ āĻāĻžāĻ āĻā§ā§āĻ āĻŦāĻāϰ āĻāĻā§ āϝāĻĨāĻžāĻā§āϰāĻŽā§ II, IV, VI, VIII āĻā§āϞāĻžāϏ⧠āĻĒā§āϤāĨ¤ āĻāĻāύ āĻāĻĻā§āϰ āĻā§āϞāĻžāϏā§āϰ āĻā§ ā§Ž āĻšāĻā§āĻžāϰ āĻāĻĨāĻžāĨ¤ āĻāĻŋāύā§āϤ⧠āĻāĻ āĻāĻžāĻ āϞāĻā§āώ āĻĻāĻŋā§ā§āĻāĻŋāϞ āĻŦāϞā§, āϤāĻžāĻĻā§āϰ āĻā§āϞāĻžāϏā§āϰ āĻā§ 8.5 āĨ¤ āϏā§āĻ āĻāĻžāĻ āĻāϤāĻŦāĻžāϰ āϞāĻā§āώ āĻĻāĻŋā§ā§āĻāĻŋāϞ?
If someone gets admitted to a class above the class he or she was meant to get admitted to, then it is called bouncing. Four brothers Kamrul, Tusher, Sakal, Zubayer used to study in class II, IV, VI, VIII respectively. However, since one of the brothers bounced, the average of their class is now 8.5. How many classes did he bounce?
3. n āĻāĻŦāĻ m āĻĻā§āĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āĻāĻŦāĻ \[ n \times n + m \times m \] āĻāĻāĻāĻŋ āĻā§ā§ āϏāĻāĻā§āϝāĻžāĨ¤ n + m āĻ⧠⧍ āĻĻāĻŋā§ā§ āĻāĻžāĻ āĻāϰāϞ⧠āĻāĻžāĻāĻļā§āώ āĻāϤ āĻšāĻŦā§?
n and m are two positive whole numbers, and \[ n \times n + m \times m \] is an even number. What will be the remainder if n + m is divided by 2?
4. āĻāĻāĻāĻŋ āϞāĻŋāĻĢāĻ āύāĻŋāĻ āϤāϞāĻž āĻĨā§āĻā§ āĻāĻ āϤāϞāĻž, āĻĻā§āĻ āϤāϞāĻž āĻāϰ⧠āĻāĻžāϰ āϤāϞāĻžā§ āϝā§āϤ⧠ā§Ēā§Ļ āϏā§āĻā§āύā§āĻĄ āϏāĻŽā§ āϞāĻžāĻā§āĨ¤ āĻāĻžāϰ āϤāϞāĻž āĻĨā§āĻā§ āώā§āϞ āϤāϞāĻžā§ āϝā§āϤ⧠āĻāϤ āϏāĻŽā§ āϞāĻžāĻāĻŦā§? (āϞāĻŋāĻĢāĻ āĻāĻāĻ āĻšāĻžāϰ⧠āĻāϞāĻā§)
A lift takes 40 seconds to go from the ground floor to the 4th floor, moving two floors at a time. How much time will it take to go from the 4th floor to the 16th floor? [The lift moves at the same rate.
5. BC āĻāϰ āĻāĻĒāϰ A āĻŦāĻŋāύā§āĻĻā§āϰ āĻāĻā§āĻāϤāĻž D āĻŦāĻŋāύā§āĻĻā§āϰ āĻāĻā§āĻāϤāĻžāϰ \[\frac{5}{3}\] āĻā§āĻŖāĨ¤ \[ \triangle ABC\] āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞ \[\triangle BDC\] āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞ = ?

The height of A above BC is \[\frac{5}{3}\] times the height of D.Area of \[ \triangle ABC\] Area of \[\triangle BDC\] = ?
6. MATH āĻļāĻŦā§āĻĻā§āϰ M āĻ
āĻā§āώāϰāĻāĻŋ āĻĢā§āϞ āĻĻā§āĻāϝāĻŧāĻž āĻšāϞāĨ¤ āĻāĻāύ āĻŦāĻžāĻāĻŋ āĻ
āĻā§āώāϰāĻā§āϞāĻŋ āĻāϞāĻāĻžāĻĒāĻžāϞāĻāĻž āĻāϰ⧠āĻāĻŽāύ āĻāϤ āĻāĻžāĻŦā§ āϏāĻžāĻāĻžāύ⧠āϝāĻžāĻŦā§ āϝā§āĻāĻžāύ⧠āϝā§āύ āĻļā§āϰā§āϤ⧠A āĻāϏā§?
The letter M is thrown away from the word MATH . How many ways can rest of the letters be jumbled so that A appear at the beginning?
7. a = 6000105 āĻāĻŦāĻ b = 4000070 āĻāϰ āĻāϏāĻžāĻā§ 2000035āĨ¤ āĻāĻāύ, \[\frac{a \times a \times a \times a \times a}{b \times b \times b \times b \times b} = \frac{c}{d}\]āĨ¤ c āĻ d āĻāϰ āĻāϏāĻžāĻā§ 1 āĻšāϞā§, c + d = ?
The GCD of a = 6000105 and b = 4000070 is 2000035. Now, \[\frac{a \times a \times a \times a \times a}{b \times b \times b \times b \times b} = \frac{c}{d}\]. If the GCD of c and d is 1, c + d = ?
8. āĻĻā§āĻāĻŋ āϏāĻāĻā§āϝāĻžāϰ āĻāϏāĻžāĻā§ āĻāĻŦāĻ āϤāĻžāĻĻā§āϰ āĻŦāϰā§āĻā§āϰ āĻāϏāĻžāĻā§āϰ āϏāĻŽāώā§āĻāĻŋ 12 āĻšāϞ⧠āϏāĻāĻā§āϝāĻžāĻā§āϞāĻŋāϰ āĻāϏāĻžāĻā§ āĻāϤ?
The sum of the GCD of two numbers and the GCD of their squares is 12. What is the GCD of the two numbers?
9. ABCD āĻŦā§āϤā§āϤ⧠AC, BD āĻŦā§āϝāĻžāϏ āĻĒāϰāϏā§āĻĒāϰ āϞāĻŽā§āĻŦāĨ¤ \[ \triangle ABD\] āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞ 9 āĻāĻŦāĻ āĻŦā§āϤā§āϤā§āϰ āĻā§āώā§āϤā§āϰāĻĢāϞ \[ x\pi\] āĻšāϞ⧠x āĻāϤ?

Within the circle ABCD, AC and BD are perpendicular. If the area of \[\triangle ABD\] is 9, and the area of the circle is\[ x\pi \], what is x?
10. 2, 5, 10, 17, 26, 37, … āϧāĻžāϰāĻžāĻāĻŋāϰ 100āϤāĻŽ āĻĒāĻĻ āĻāϤ āĻšāĻŦā§?
2, 5, 10, 17, 26, 37, … . What is the 100th term of this sequence?

