Regional questions of BD math olympiad 2017

Primary Category – Dhaka Region

1. 30, 53, 29, 32, 15, 9, 22, 47, 49, 13, 40, 33 āĻāχ āϏāĻ‚āĻ–ā§āϝāĻžāϗ⧁āϞ⧋ āĻĨ⧇āϕ⧇ āĻĻ⧁āϟāĻŋ āĻ•āϰ⧇ āϏāĻ‚āĻ–ā§āϝāĻž āύāĻŋā§Ÿā§‡ āĻŽā§‹āϟ ā§ŦāϟāĻŋ āĻœā§‹ā§œāĻž āĻ—āĻ āύ āĻ•āϰāĻž āĻšāϞāĨ¤ āĻāχ āĻœā§‹ā§œāĻžāϗ⧁āϞ⧋āϰ āĻĒā§āϰāϤāĻŋāϟāĻŋāϰ āϏāĻĻāĻ¸ā§āϝ āϏāĻ‚āĻ–ā§āϝāĻžāϗ⧁āϞ⧋āϰ āϝ⧋āĻ—āĻĢāϞ āϏāĻŽāĻžāύāĨ¤ āĻāχāĻ­āĻžāĻŦ⧇ āĻœā§‹ā§œāĻž āĻ—āĻ āύ āĻ•āϰāĻž āĻšāϞ⧇ 22 āĻāϰ āϏāĻžāĻĨ⧇ āĻāĻ•āχ āĻœā§‹ā§œāĻžā§Ÿ āϕ⧋āύ āϏāĻ‚āĻ–ā§āϝāĻž āĻ›āĻŋāϞ?

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.  āϚāĻŋāĻ¤ā§āϰ⧇, MN, AB āĻāϰ āωāĻĒāϰ āϞāĻŽā§āĻŦāĨ¤ āĻāϰ āĻŽāĻžāύ āĻ•āϤ āĻĄāĻŋāĻ—ā§āϰ⧀?

Regional questions of BD math olympiad 2017
In figure, MN is perpendicular to AB.Find the value of x.

3. \[ \frac{2121212121210}{1121212121211}\] āĻ­āĻ—ā§āύāĻžāĻ‚āĻļāϟāĻŋāϕ⧇ \[\frac{a}{b}\] āφāĻ•āĻžāϰ⧇ āĻĒā§āϰāĻ•āĻžāĻļ āĻ•āϰāĻž āϝāĻžā§Ÿ āϝ⧇āĻ–āĻžāύ⧇ a, b āĻĻ⧁āχāϟāĻŋ āϏāĻšāĻŽā§ŒāϞāĻŋāĻ• āϏāĻ‚āĻ–ā§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. āĻāĻ•āϟāĻŋ āϖ⧇āϞāĻžā§Ÿ āĻĻ⧁āϟāĻŋ āĻ•āĻžāĻ—āϜ āĻĻā§‡ā§ŸāĻž āĻĨāĻžāϕ⧇ āϤāĻžāϰ āĻŽāĻ§ā§āϝ⧇ āĻĨ⧇āϕ⧇ āĻĻ⧈āĻŦāϚ⧟āύ āĻ āĻāĻ•āϟāĻŋ āϤ⧋āϞāĻž āĻšāĻŦ⧇āĨ¤ āĻ•āĻžāĻ—āϜ āĻĻ⧁āϟāĻŋāϰ āĻāĻ•āϟāĻŋāϤ⧇ ⧝ āϞ⧇āĻ–āĻž āĻĨāĻžāĻ•āĻŦ⧇ āφāϰ āĻ…āĻĒāϰāϟāĻŋāϤ⧇ ā§ĢāĨ¤ āĻāĻ•āϜāύ āĻ•āĻžāĻ—āϜ āϤ⧁āϞāϞ⧇ āϏ⧇āϟāĻŋāϤ⧇ āϝāϤ āύāĻŽā§āĻŦāϰ āϞ⧇āĻ–āĻž āĻĨāĻžāĻ•āĻŦ⧇, āϏ⧇āϟāĻžāχ āĻšāĻŦ⧇ āϤāĻžāϰ āĻĒā§Ÿā§‡āĻ¨ā§āϟāĨ¤ āĻāĻ•āϜāύ āϝāϤāϖ⧁āĻļāĻŋ āϤāϤ āĻĒā§Ÿā§‡āĻ¨ā§āϟ āύāĻŋāϤ⧇ āĻĒāĻžāϰ⧇āĨ¤ āĻāχ āϖ⧇āϞāĻžā§Ÿ āĻ•āĻŋāϛ⧁ āĻĒā§Ÿā§‡āĻ¨ā§āϟ āĻ…āĻ°ā§āϜāύ āĻ…āϏāĻŽā§āĻ­āĻŦ, āϝ⧇āĻŽāύ ā§Ŧ, ā§§ā§ŠāĨ¤ āĻāχ āϖ⧇āϞāĻžā§Ÿ āϏāĻ°ā§āĻŦā§‹āĻšā§āϚ āĻ•āϤāϤāĻŽ āĻĒā§Ÿā§‡āĻ¨ā§āϟ āĻĒāĻžāĻ“ā§ŸāĻž 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 can’t be achived such as 6, 13. Which largest point can’t be achived?

5. ABCD āĻŦāĻ°ā§āϗ⧇āϰ āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻŦāĻžāĻšā§āϰ āĻĻ⧈āĻ°ā§āĻ˜ā§āϝ 12 āĻāĻ•āĻ• āĻāĻŦāĻ‚ O āĻāϰ āϕ⧇āĻ¨ā§āĻĻā§āϰāĨ¤ AOEB āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ AOF āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ⧇āϰ āĻĻā§āĻŦāĻŋāϗ⧁āĻŖāĨ¤ BE āĻāϰ āĻĻ⧈āĻ°ā§āĻ˜ā§āϝ āĻ•āϤ?

%Focuse keyword%

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 āĻĨ⧇āϕ⧇ āĻ•āϤāĻ­āĻžāĻŦ⧇ āϚāĻžāϰāϟāĻŋ āϤāĻŋāύ āĻ…āĻ™ā§āϕ⧇āϰ āϏāĻ‚āĻ–ā§āϝāĻž āĻāĻŽāύāĻ­āĻžāĻŦ⧇ āĻŦāĻžāĻ›āĻžāχ āĻ•āϰāĻž āϝāĻžāϝāĻŧ āϝ⧇āύ āĻāχ āϚāĻžāϰāϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻžāϰ āϝ⧋āĻ—āĻĢāϞ 3 āĻĻā§āĻŦāĻžāϰāĻž āĻŦāĻŋāĻ­āĻžāĻœā§āϝ āĻšāϝāĻŧ? āωāĻĻāĻžāĻšāϰāĻŖ: (a, b, c, d); (b, a, c, d); â€Ļ â€Ļ āϕ⧇ āĻāĻ•āχ āĻŦāĻŋāĻŦ⧇āϚāύāĻž āĻ•āϰāĻž 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); â€Ļ â€Ļ are considered to be the same.

7. \[ \frac{7x + 1}{2}, \frac{7x + 2}{3}, \frac{7x + 3}{4}, \dots, \frac{7x + 2016}{2017}\] āϝ⧇āĻ–āĻžāύ⧇ x āĻāĻ•āϟāĻŋ āϧāύāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āĻāĻŦāĻ‚ \[ x \leq 299 \]āĨ¤ x -āĻāϰ āĻāĻŽāύ āĻ•āĻŋāϛ⧁ āĻŽāĻžāύ āϏāĻŽā§āĻ­āĻŦ āϝāĻžāϰ āĻĒā§āϰāϤāĻŋāϟāĻŋāϰ āϜāĻ¨ā§āϝ āωāĻĒāϰ⧇āϰ āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻ­āĻ—ā§āύāĻžāĻ‚āĻļāϕ⧇ āĻāĻŽāύ āĻ­āĻ—ā§āύāĻžāĻ‚āĻļ⧇ āĻĒā§āϰāĻ•āĻžāĻļ āĻ•āϰāĻž āϝāĻžāϝāĻŧ āϝ⧇āĻ–āĻžāύ⧇ āĻāϰ āĻšāϰ āĻ“ āϞāĻŦ āϏāĻšāĻŽā§‡āϞāύāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āĻšāϝāĻŧāĨ¤ x -āĻāϰ āĻāĻŽāύ āĻ•āϤāϟāĻŋ āĻŽāĻžāύ āφāϛ⧇?
\[ \frac{7x + 1}{2}, \frac{7x + 2}{3}, \frac{7x + 3}{4}, \dots, \frac{7x + 2016}{2017}\]

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§ āĻ¤ā§āϰāĻŋāϭ⧁āĻœā§‡ AB = AC āĻāĻŦāĻ‚ \[\angle A = 100^\circ\]āĨ¤ D, AB āĻāϰ āĻ“āĻĒāϰ āĻāĻŽāύ āĻāĻ•āϟāĻŋ āĻŦāĻŋāĻ¨ā§āĻĻ⧁ āϝ⧇āύ CD, \[\angle ACB\] āϕ⧇ āϏāĻŽāĻžāύ āĻĻ⧁āχāϟāĻŋ āĻ…āĻ‚āĻļ⧇ āĻŦāĻŋāĻ­āĻ•ā§āϤ āĻ•āϰ⧇āĨ¤ āϝāĻĻāĻŋ BC -āϰ āĻĻ⧈āĻ°ā§āĻ˜ā§āϝ 2018 āĻāĻ•āĻ• āĻšāϝāĻŧ, āϤāĻŦ⧇ 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• āϏāĻ‚āĻ–ā§āϝāĻžā§Ÿ āωāĻ¤ā§āϤāϰ āĻĻāĻžāĻ“āĨ¤
\[\frac{2}{10} + \frac{6}{100} + \frac{4}{1000}\] = ? Write your answer in decimal.

2. āϝāĻĻāĻŋ āϕ⧇āω āϝ⧇ āĻ•ā§āϞāĻžāϏ⧇ āĻ“āĻ āĻžāϰ āĻ•āĻĨāĻž āϤāĻžāϤ⧇ āύāĻž āωāϠ⧇ āϤāĻžāϰ āωāĻĒāϰ⧇āϰ āĻ•ā§āϞāĻžāϏ⧇ āωāϠ⧇ āϝāĻžā§Ÿ, āϤāĻžāϕ⧇ āϞāĻ•ā§āώ āĻĻ⧇āĻ“āϝāĻŧāĻž āĻŦāϞ⧇āĨ¤ āĻ•āĻžāĻŽāϰ⧁āϞ, āϤ⧁āώāĻžāϰ, āϏāĻžāĻ•āĻžāϞ, āϜ⧁āĻŦāĻžā§Ÿā§‡āϰ āϚāĻžāϰ āĻ­āĻžāχ āĻ•ā§Ÿā§‡āĻ• āĻŦāĻ›āϰ āφāϗ⧇ āϝāĻĨāĻžāĻ•ā§āϰāĻŽā§‡ II, IV, VI, VIII āĻ•ā§āϞāĻžāϏ⧇ āĻĒ⧜āϤāĨ¤ āĻāĻ–āύ āĻ“āĻĻ⧇āϰ āĻ•ā§āϞāĻžāϏ⧇āϰ āĻ—ā§œ ā§Ž āĻšāĻ“ā§ŸāĻžāϰ āĻ•āĻĨāĻžāĨ¤ āĻ•āĻŋāĻ¨ā§āϤ⧁ āĻāĻ• āĻ­āĻžāχ āϞāĻ•ā§āώ āĻĻāĻŋā§Ÿā§‡āĻ›āĻŋāϞ āĻŦāϞ⧇, āϤāĻžāĻĻ⧇āϰ āĻ•ā§āϞāĻžāϏ⧇āϰ āĻ—ā§œ 8.5 āĨ¤ āϏ⧇āχ āĻ­āĻžāχ āĻ•āϤāĻŦāĻžāϰ āϞāĻ•ā§āώ āĻĻāĻŋā§Ÿā§‡āĻ›āĻŋāϞ?
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 āĻāĻŦāĻ‚ m āĻĻ⧁āϟāĻŋ āϧāύāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āĻāĻŦāĻ‚ \[ n \times n + m \times m \] āĻāĻ•āϟāĻŋ āĻœā§‹ā§œ āϏāĻ‚āĻ–ā§āϝāĻžāĨ¤ n + m āϕ⧇ ⧍ āĻĻāĻŋā§Ÿā§‡ āĻ­āĻžāĻ— āĻ•āϰāϞ⧇ āĻ­āĻžāĻ—āĻļ⧇āώ āĻ•āϤ āĻšāĻŦ⧇?
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. āĻāĻ•āϟāĻŋ āϞāĻŋāĻĢāϟ āύāĻŋāϚ āϤāϞāĻž āĻĨ⧇āϕ⧇ āĻāĻ• āϤāϞāĻž, āĻĻ⧁āχ āϤāϞāĻž āĻ•āϰ⧇ āϚāĻžāϰ āϤāϞāĻžā§Ÿ āϝ⧇āϤ⧇ ā§Ēā§Ļ āϏ⧇āϕ⧇āĻ¨ā§āĻĄ āϏāĻŽā§Ÿ āϞāĻžāϗ⧇āĨ¤ āϚāĻžāϰ āϤāϞāĻž āĻĨ⧇āϕ⧇ āώ⧋āϞ āϤāϞāĻžā§Ÿ āϝ⧇āϤ⧇ āĻ•āϤ āϏāĻŽā§Ÿ āϞāĻžāĻ—āĻŦ⧇? (āϞāĻŋāĻĢāϟ āĻāĻ•āχ āĻšāĻžāϰ⧇ āϚāϞāϛ⧇)

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 āĻāϰ āωāĻĒāϰ A āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϰ āωāĻšā§āϚāϤāĻž D āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϰ āωāĻšā§āϚāϤāĻžāϰ \[\frac{5}{3}\] āϗ⧁āĻŖāĨ¤ \[ \triangle ABC\] āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ \[\triangle BDC\] āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ = ?

%Focuse keyword%

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§āĻĻ⧇āϰ M āĻ…āĻ•ā§āώāϰāϟāĻŋ āĻĢ⧇āϞ āĻĻ⧇āĻ“āϝāĻŧāĻž āĻšāϞāĨ¤ āĻāĻ–āύ āĻŦāĻžāĻ•āĻŋ āĻ…āĻ•ā§āώāϰāϗ⧁āϞāĻŋ āωāϞāϟāĻžāĻĒāĻžāϞāϟāĻž āĻ•āϰ⧇ āĻāĻŽāύ āĻ•āϤ āĻ­āĻžāĻŦ⧇ āϏāĻžāϜāĻžāύ⧋ āϝāĻžāĻŦ⧇ āϝ⧇āĻ–āĻžāύ⧇ āϝ⧇āύ āĻļ⧁āϰ⧁āϤ⧇ A āφāϏ⧇?
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 āĻāĻŦāĻ‚ b = 4000070 āĻāϰ āĻ—āϏāĻžāϗ⧁ 2000035āĨ¤ āĻāĻ–āύ, \[\frac{a \times a \times a \times a \times a}{b \times b \times b \times b \times b} = \frac{c}{d}\]āĨ¤ c āĻ“ d āĻāϰ āĻ—āϏāĻžāϗ⧁ 1 āĻšāϞ⧇, 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. āĻĻ⧁āϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻžāϰ āĻ—āϏāĻžāϗ⧁ āĻāĻŦāĻ‚ āϤāĻžāĻĻ⧇āϰ āĻŦāĻ°ā§āϗ⧇āϰ āĻ—āϏāĻžāϗ⧁āϰ āϏāĻŽāĻˇā§āϟāĻŋ 12 āĻšāϞ⧇ āϏāĻ‚āĻ–ā§āϝāĻžāϗ⧁āϞāĻŋāϰ āĻ—āϏāĻžāϗ⧁ āĻ•āϤ?
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 āĻŦ⧃āĻ¤ā§āϤ⧇ AC, BD āĻŦā§āϝāĻžāϏ āĻĒāϰāĻ¸ā§āĻĒāϰ āϞāĻŽā§āĻŦāĨ¤ \[ \triangle ABD\] āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ 9 āĻāĻŦāĻ‚ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ \[ x\pi\] āĻšāϞ⧇ x āĻ•āϤ?

%Focuse keyword%

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, … āϧāĻžāϰāĻžāϟāĻŋāϰ 100āϤāĻŽ āĻĒāĻĻ āĻ•āϤ āĻšāĻŦ⧇?

2, 5, 10, 17, 26, 37, … . What is the 100th term of this sequence?

 

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