BD Math Olympiad regional questions 2023

1. āĻāĻ•āϟāĻŋ āĻŦāĻžāϞāϤāĻŋāϤ⧇ āϞāĻžāϞ, āύ⧀āϞ āĻāĻŦāĻ‚ āϏāĻŦ⧁āϜ āϰāϙ⧇āϰ āϝāĻĨāĻžāĻ•ā§āϰāĻŽā§‡ 1971, 1952 āĻāĻŦāĻ‚ 2022 āϟāĻŋ āĻŦāϞ āĻ°ā§Ÿā§‡āϛ⧇āĨ¤ āϜ⧟ āϤāĻžāϰ āĻšā§‹āĻ– āĻŦ⧇āρāϧ⧇ āĻ•āĻŋāϛ⧁ āĻŦāϞ āĻŦāĻžāϞāϤāĻŋ āĻĨ⧇āϕ⧇ āϤ⧁āϞāϤ⧇ āĻŦāϞāĻž āĻšāϞāĨ¤ āĻ¨ā§āϝ⧂āύāϤāĻŽ āĻ•āϤāϟāĻŋ āĻŦāϞ āϤ⧁āϞāϞ⧇ āϜ⧟ āύāĻŋāĻļā§āϚāĻŋāϤāĻ­āĻžāĻŦ⧇ āĻŦāϞāϤ⧇ āĻĒāĻžāϰāĻŦ⧇ āϝ⧇, āϏ⧇ āĻĒā§āϰāϤāĻŋāϟāĻŋ āϰāϙ⧇āϰ āĻ•āĻŽāĻĒāĻ•ā§āώ⧇ āĻāĻ•āϟāĻŋ āĻŦāϞ āϤ⧁āϞ⧇āϛ⧇?

A basket contains 1971, 1952 and 2022 balls of red, blue and green, respectively. Joy is blindfolded and he is asked to pick up some balls from the basket. After picking at least how many balls, Joy can surely say that he has picked at least one ball of each colour?

2. āĻĢ⧁⧟āĻžāĻĻ⧇āϰ āĻĒā§āϰāĻŋ⧟ āϏāĻ‚āĻ–ā§āϝāĻž 11, āϤāĻžāχ āϏ⧇ 11 āĻĻā§āĻŦāĻžāϰāĻž āύāĻŋāσāĻļ⧇āώ āĻŦāĻŋāĻ­āĻžāĻœā§āϝ āϏāĻ•āϞ āϏāĻ‚āĻ–ā§āϝāĻžāϕ⧇ ‘āϏ⧁āĻ¨ā§āĻĻāϰ āϏāĻ‚āĻ–ā§āϝāĻžâ€™ āĻŦāϞ⧇āĨ¤ āĻĒāĻžāρāϚ āĻ…āĻ™ā§āϕ⧇āϰ āĻŦ⧃āĻšāĻ¤ā§āϤāĻŽ āĻ“ āĻ•ā§āώ⧁āĻĻā§āϰāϤāĻŽ ‘āϏ⧁āĻ¨ā§āĻĻāϰ āϏāĻ‚āĻ–ā§āϝāĻžâ€™ āĻāϰ āĻĒāĻžāĻ°ā§āĻĨāĻ•ā§āϝ āĻ•āϤ?

Fuad’s favourite number is 11, so he calls all numbers divisible by 11 ‘Beautiful Numbers’. What is the difference between the largest and smallest five-digit ‘Beautiful Number’?

3. āϚāĻŋāĻ¤ā§āϰ⧇ ∠𝒙 = ā§Ŧā§Ļ°, ∠𝒚 = ā§­ā§Ļ°, ∠𝒛 = ā§Žā§Ļ° āĻšāϞ⧇ ∠𝒘 āĻāϰ āĻŽāĻžāύ āĻ•āϤ?

%Focuse keyword%

In the figure, ∠𝒙 = 𝟔0°, ∠𝒚 = 𝟕0°, ∠𝒛𝒛 = 𝟖0°. What is the value of ∠𝒘?

4. 10 āϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻžāϰ āĻ—ā§œ 49āĨ¤ āϝāĻĻāĻŋ āĻĒā§āϰāϤāĻŋāϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻžāϕ⧇ 7 āĻĻāĻŋā§Ÿā§‡ āĻ­āĻžāĻ— āĻ•āϰāĻž āĻšā§Ÿ āĻāĻŦāĻ‚ āĻ­āĻžāĻ—āĻĢāϞ-āĻāϰ āϏāĻžāĻĨ⧇ 5 āϝ⧋āĻ— āĻ•āϰāĻž āĻšā§Ÿ āϤāĻŦ⧇ āĻĒāϰāĻŋāĻŦāĻ°ā§āϤāĻŋāϤ āĻ—ā§œ āĻ•āϤ āĻšāĻŦ⧇?

The average of 10 numbers is 49. If each of the numbers is divided by 7 and the quotient is then added by 5, what is the changed average number?

5. āϰāĻŋāĻŽāϞ ā§Šā§Ÿ āĻļā§āϰ⧇āĻŖāĻŋāϤ⧇ āĻĒā§œā§‡āĨ¤ āϏ⧇ ā§ĢāĻŽ āĻļā§āϰ⧇āĻŖāĻŋāϰ āĻ—āĻŖāĻŋāϤ āĻŦāχ āĻĒāĻžāĻļāĻžāĻĒāĻžāĻļāĻŋ āĻĒ⧜āϤ⧇ āϚāĻžā§ŸāĨ¤ āϏāĻĒā§āϤāĻžāĻšā§‡ ā§Ē āĻĻāĻŋāύ āϏ⧇ āĻ—āĻŖāĻŋāϤ āĻĒā§œā§‡āĨ¤ āĻāϰ āĻŽāĻ§ā§āϝ⧇ āϏāĻ°ā§āĻŦā§‹āĻšā§āϚ āĻĻ⧁āχ āĻĻāĻŋāύ āϏ⧇ ā§ĢāĻŽ āĻļā§āϰ⧇āĻŖāĻŋāϰ āĻŦāχ āĻĒ⧜āϤ⧇ āĻĒāĻžāϰāĻŦ⧇ āĻāĻŦāĻ‚ āĻāĻ•āĻĻāĻŋāύ⧇ 3 āĻĒ⧃āĻˇā§āĻ āĻžāϰ āĻŦ⧇āĻļāĻŋ āĻĒ⧜āϤ⧇ āĻĒāĻžāϰ⧇ āύāĻžāĨ¤ āĻŦāχāϟāĻŋāϤ⧇ 150 āĻĒ⧃āĻˇā§āĻ āĻž āĻĨāĻžāĻ•āϞ⧇ āϏ⧇ āϜāĻžāύ⧁⧟āĻžāϰ⧀āϰ 10 āϤāĻžāϰāĻŋāĻ– āĻĨ⧇āϕ⧇ āĻļ⧁āϰ⧁ āĻ•āϰāϞ⧇ āϏāĻ°ā§āĻŦāύāĻŋāĻŽā§āύ āϝ⧇ āϤāĻžāϰāĻŋāϖ⧇ āĻŦāχāϟāĻŋ āĻĒā§œā§‡ āĻļ⧇āώ āĻ•āϰāϤ⧇ āĻĒāĻžāϰ⧇ āϤāĻž āύāĻŋāĻ°ā§āϪ⧟ āĻ•āϰāĨ¤

Rimil is in third standard. She wants to study 5th standard’s mathematics book as well as his third standard mathematics book. She cannot read more than 3 pages a day and there are 150 pages of that book. If she started reading that book from 10th January, which is the quickest date she will finish the book?

6. 𝒂, 𝒃, 𝒄, 𝒅, 𝒆, 𝒇 āϏāĻ‚āĻ–ā§āϝāĻž 1 āĻĨ⧇āϕ⧇ 6 āĻĒāĻ°ā§āϝāĻ¨ā§āϤ āĻ›ā§ŸāϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻž āĻŦā§‹āĻāĻžā§ŸāĨ¤ 𝒂 + 𝒃 = 𝒄, 𝒃 + 𝒄 = 𝒅, 𝒆 + 𝒄 = 𝒇 āĻšāϞ⧇ 𝒆 āĻāϰ āĻŽāĻžāύ āĻ•āϤ?

The variables 𝒂, 𝒃, 𝒄, 𝒅, 𝒆 and 𝒇 each represent exactly one of the integers 𝟏 through 𝟔. Given the following facts, which integer is represented by 𝒆? 𝒂 + 𝒃 = 𝒄, 𝒃 + 𝒄 = 𝒅, 𝒆 + 𝒄 = 𝒇
7. āφāĻĻāĻŋ⧟āύ āϤāĻžāϰ āĻ•āĻžāϛ⧇ āĻĨāĻžāĻ•āĻž 815 āϟāĻŋ āĻŽāĻžāĻ°ā§āĻŦ⧇āϞ āĻŦāĻžāĻ•ā§āϏ⧇ āĻ­āϰ⧇ āϰāĻžāĻ–āĻ›āĻŋāϞāĨ¤ āϤāĻžāϰ āĻ•āĻžāϛ⧇ 10, 25, 50 āĻ…āĻĨāĻŦāĻž 100 āĻŽāĻžāĻ°ā§āĻŦ⧇āϞ āϧāĻžāϰāĻŖ āĻ•āϰāϤ⧇ āĻĒāĻžāϰ⧇ āĻāĻŽāύ āĻŦāĻžāĻ•ā§āϏ āĻ°ā§Ÿā§‡āϛ⧇āĨ¤ āϝāĻĻāĻŋ āφāĻĻāĻŋ⧟āύ āĻĒā§āϰāϤāĻŋ āϏāĻžāχāĻœā§‡ āϏāĻ°ā§āĻŦā§‹āĻšā§āϚ 5āϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāϤ⧇ āĻĒāĻžāϰ⧇ āĻāĻŦāĻ‚ āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āϤāĻžāϕ⧇ āĻĒā§‚āĻ°ā§āĻŖāĻ­āĻžāĻŦ⧇ āĻ­āϰāϤ⧇ āĻšāĻŦ⧇, āϤāĻžāĻšāϞ⧇ āφāĻĻāĻŋ⧟āύ āϤāĻžāϰ āĻ•āĻžāϛ⧇ āĻĨāĻžāĻ•āĻž āĻŽāĻžāĻ°ā§āĻŦ⧇āϞāϗ⧁āϞ⧋ āϰāĻžāĻ–āĻžāϰ āϜāĻ¨ā§āϝ āĻ•āĻŽāĻĒāĻ•ā§āώ⧇ āĻ•āϤāϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāĻŦ⧇?

Adyan is packing 815 marbles into boxes. He has boxes that can hold 10, 25, 50 or 100 marbles. If Adyan can use at most 5 boxes of each size and must fill each box he uses, what is the minimum number of boxes he requires to pack all the marbles to pack 815 marbles?

8. āϰāĻĢāĻŋāĻ• āĻāĻŦāĻ‚ āĻļāĻĢāĻŋāϕ⧇āϰ āĻ•āĻžāϛ⧇ āϝāĻĨāĻžāĻ•ā§āϰāĻŽā§‡ 219 āĻāĻŦāĻ‚ 133āϟāĻŋ āϚāϕ⧋āϞ⧇āϟ āĻ°ā§Ÿā§‡āϛ⧇āĨ¤ āϰāĻĢāĻŋāĻ• āĻĒā§āϰāϤāĻŋāĻĻāĻŋāύ 5āϟāĻŋ āϚāϕ⧋āϞ⧇āϟ āĻ–āĻžā§Ÿ āĻāĻŦāĻ‚ āĻļāĻĢāĻŋāĻ• āĻĒā§āϰāϤāĻŋāĻĻāĻŋāύ 3āϟāĻŋ āϚāϕ⧋āϞ⧇āϟ āĻ–āĻžā§ŸāĨ¤ āĻ•āĻŋāϛ⧁āĻĻāĻŋāύ āĻĒāϰ⧇, āĻĻ⧁āϜāύ⧇āϰ āĻ•āĻžāϛ⧇ āĻāĻ•āχ āϏāĻ‚āĻ–ā§āϝāĻ• āϚāϕ⧋āϞ⧇āϟ āĻ›āĻŋāϞāĨ¤ āϤāĻ–āύ āĻĻ⧁āϜāύ⧇āϰ āĻ•āĻžāϛ⧇ āĻ•ā§ŸāϟāĻŋ āϚāϕ⧋āϞ⧇āϟ āĻ›āĻŋāϞ?

Rafiq and Shafiq have 219 and 133 chocolates. Rafiq eats 5 chocolates a day and Shafiq eats 3 chocolates a day. After some days, both had the same number of chocolates. How chocolates each of them had that day?

 

Junior category

1. 3 āϟāĻŋ āϧāύāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžāϰ āĻ—ā§œ 2 āĻšāϞ⧇, āϤāĻžāĻĻ⧇āϰ āĻŽāĻ§ā§āϝ⧇ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻŦ⧜ āϏāĻ‚āĻ–ā§āϝāĻž āĻ•āϤ?

If the average of 3 different positive integers is 2, then what is the value of the highest number among them?

2. 7 āϟāĻŋ āĻ•ā§āϰāĻŽāĻŋāĻ• āĻŽā§ŒāϞāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻžāϰ āϝ⧋āĻ—āĻĢāϞ 58āĨ¤ āϤāĻžāĻšāϞ⧇ āϤāĻžāĻĻ⧇āϰ āĻŽāĻ§ā§āϝ⧇ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻŦ⧜ āĻāĻŦāĻ‚ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āϛ⧋āϟ āĻŽā§ŒāϞāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āĻĻ⧁āϟāĻŋāϰ āϝ⧋āĻ—āĻĢāϞ āĻ•āϤ?

The sum of 7 consecutive prime numbers is 58. Then what is the sum of the highest and lowest prime numbers among them?

3. āĻĢ⧁⧟āĻžāĻĻ āĻāĻ•āϟāĻŋ āĻ—āĻžāĻŖāĻŋāϤāĻŋāĻ• āϧāĻžāϰāĻž āύāĻŋā§Ÿā§‡ āĻ•āĻžāϜ āĻ•āϰāϛ⧇ āϏāĻ•āĻžāϞ āĻĨ⧇āϕ⧇āĨ¤ āĻ•āĻŋāĻ¨ā§āϤ⧁ āϏ⧇ āϧāĻžāϰāĻž āϏāĻŽāĻžāϧāĻžāύ āĻ•āϰāϤ⧇ āĻĒāĻžāϰāϛ⧇ āύāĻžāĨ¤ āϧāĻžāϰāĻžāϟāĻŋ āĻšāϞ 𝟒0, 𝟒5, 𝟓2, 𝟔3, 𝟕6, đ‘ŋ, 𝒀, 𝟏35āĨ¤ āĻĢ⧁⧟āĻžāĻĻ⧇āϰ āĻ•āĻžāϛ⧇ āĻ›āĻŋāϞ 𝑍 = đ‘ŋ + 𝑌 āĻšāϞ⧇ 𝑍 āĻāϰ āĻŽāĻžāύ āĻ•āϤ?

Fuad has been working on a mathematical series since morning. But still, he could not solve the series. Here is the series 𝟒0, 𝟒5, 𝟓2, 𝟔3, 𝟕6, đ‘ŋ, 𝒀, 𝟏35. The question to Fuad was 𝒁 = đ‘ŋ + 𝒀, what is the value of 𝒁? Now your task is to find the value of 𝒁.

4. āĻĻ⧁āϟāĻŋ āĻ…āĻ™ā§āϕ⧇āϰ āĻ•āϤāϗ⧁āϞ⧋ āϏāĻ‚āĻ–ā§āϝāĻž āĻ°ā§Ÿā§‡āϛ⧇, āϝāĻžāĻĻ⧇āϰ āĻ…āĻ™ā§āĻ•āϗ⧁āϞāĻŋāϰ āϗ⧁āĻŖāĻĢāϞ āĻāĻ•āϟāĻŋ āĻŦāĻ°ā§āĻ—āϏāĻ‚āĻ–ā§āϝāĻž?

How many two-digit numbers are there, whose product of the digits is a square number?

5. 𝒂, 𝒃, 𝒄, 𝒅, 𝒆, āĻāĻŦāĻ‚ 𝒇 āĻĒā§āϰāĻ¤ā§āϝ⧇āĻ•āϟāĻŋ āĻŦāĻ°ā§āĻŖ 1 āĻĨ⧇āϕ⧇ 6 āĻĒāĻ°ā§āϝāĻ¨ā§āϤ āĻ āĻŋāĻ• āĻāĻ•āϟāĻŋ āĻ•āϰ⧇ āϏāĻ‚āĻ–ā§āϝāĻž āύāĻŋāĻ°ā§āĻĻ⧇āĻļ āĻ•āϰ⧇ āĨ¤ āύāĻŋāĻšā§‡āϰ āϤāĻĨā§āϝāϗ⧁āϞ⧋āϰ āωāĻĒāϰ āĻ­āĻŋāĻ¤ā§āϤāĻŋ āĻ•āϰ⧇ 𝒆 āĻāϰ āĻŽāĻžāύ āĻ•āϤ āĻšāĻŦ⧇? 𝒂 + 𝒃 = 𝒄, 𝒃 + 𝒄 = 𝒅, 𝒆 + 𝒄 = 𝒇

The letters 𝒂, 𝒃, 𝒄, 𝒅, 𝒆, and 𝒇 each represent exactly one of the integers from 1 to 6. Given the following facts below, which integer is represented by 𝒆 ? 𝒂 + 𝒃 = 𝒄, 𝒃 + 𝒄 = 𝒅, 𝒆 + 𝒄 = 𝒇

6. āφāĻĻāĻŋ⧟āύ āϤāĻžāϰ āĻ•āĻžāϛ⧇ āĻĨāĻžāĻ•āĻž 815 āϟāĻŋ āĻŽāĻžāĻ°ā§āĻŦ⧇āϞ āĻŦāĻžāĻ•ā§āϏ⧇ āĻ­āϰ⧇ āϰāĻžāĻ–āĻ›āĻŋāϞāĨ¤ āϤāĻžāϰ āĻ•āĻžāϛ⧇ 10, 25, 50 āĻ…āĻĨāĻŦāĻž 100 āĻŽāĻžāĻ°ā§āĻŦ⧇āϞ āϧāĻžāϰāĻŖ āĻ•āϰāϤ⧇ āĻĒāĻžāϰ⧇ āĻāĻŽāύ āĻŦāĻžāĻ•ā§āϏ āĻ°ā§Ÿā§‡āϛ⧇āĨ¤ āϝāĻĻāĻŋ āφāĻĻāĻŋ⧟āύ āĻĒā§āϰāϤāĻŋ āφāĻ•āĻžāϰ⧇āϰ āϏāĻ°ā§āĻŦā§‹āĻšā§āϚ 5āϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāϤ⧇ āĻĒāĻžāϰ⧇ āĻāĻŦāĻ‚ āϤāĻžāϰ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāĻž āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āϤāĻžāϕ⧇ āĻŽāĻžāĻ°ā§āĻŦ⧇āϞ āĻĻā§āĻŦāĻžāϰāĻž āĻĒā§‚āĻ°ā§āĻŖāĻ­āĻžāĻŦ⧇ āĻ­āϰāϤ⧇ āĻšāĻŦ⧇, āϤāĻžāĻšāϞ⧇ āφāĻĻāĻŋ⧟āύ āϤāĻžāϰ āĻ•āĻžāϛ⧇ āĻĨāĻžāĻ•āĻž āĻŽāĻžāĻ°ā§āĻŦ⧇āϞāϗ⧁āϞ⧋ āϰāĻžāĻ–āĻžāϰ āϜāĻ¨ā§āϝ āĻ•āĻŽāĻĒāĻ•ā§āώ⧇ āĻ•āϤāϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāĻŦ⧇?

Adyan is packing marbles into boxes. He has boxes that can hold 10,25,50 or 100 marbles. If Adyan can use at most 5 boxes of each size and must fill each box with marbles he uses, what is the minimum number of boxes he requires to pack all the marbles to pack 815 marbles?

7. āĻāĻ•āϟāĻŋ āĻĒā§āϝāĻžāϟāĻžāĻ°ā§āύ āϚāĻŋāĻ¤ā§āϰ⧇ āĻŽāϤ āϚāϞāϤ⧇ āĻĨāĻžāĻ•āϞ⧇, ⧝āĻŽ āϚāĻŋāĻ¤ā§āϰ⧇ āĻ•āϤāϟāĻŋ āĻŦ⧃āĻ¤ā§āϤ āĻĨāĻžāĻ•āĻŦ⧇?

%Focuse keyword%

If a pattern continues according to the figure, how many circles will there be in the 9th figure?

8. āϚāĻŋāĻ¤ā§āϰ⧇ 𝑨B||đ‘ŦF||đ‘ĒD, Δ𝑩EC āĻāĻ•āϟāĻŋ āϏāĻŽāĻŦāĻžāĻšā§ āĻ¤ā§āϰāĻŋāϭ⧁āϜāĨ¤đ‘ŦF, đ‘ĒM āĻāĻŦāĻ‚ BN āĻšāϞ āĻ¤ā§āϰāĻŋāϭ⧁āĻœā§‡āϰ āϤāĻŋāύāϟāĻŋ āĻŽāĻ§ā§āϝāĻŽāĻžāĨ¤ āϝāĻĻāĻŋ, ∆𝑨đ‘Ŧđ‘Ē āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ 3√3 āĻšā§Ÿ, āϤāĻžāĻšāϞ⧇ 𝑨M + đ‘ĩD =?

%Focuse keyword%

In the figure, 𝑨B||đ‘ŦF||đ‘ĒD, Δ𝑩EC is an equilateral triangle, đ‘ŦF, đ‘ĒM and 𝑩N are the three medians of the triangle. If the area of, Δ𝑩EC is 𝟑√𝟑,then 𝑨M + đ‘ĩD =?

 

Secondary Category
1. āχāĻŽāύ āϕ⧋āύ āĻāĻ•āϟāĻŋ āϞāĻŋāĻĢāĻŸā§‡āϰ āωāĻĒāϰ⧇ āĻ“āĻ āĻžāϰ āϏāĻŽā§Ÿ āĻĻ⧇āϖ⧇ āϝ⧇, āϞāĻŋāĻĢāϟ āϕ⧋āύ āĻāĻ•āϟāĻŋ āϤāϞāĻžā§Ÿ āĻĨāĻžāĻŽāϞ⧇ āϏ⧇āĻ–āĻžāύ 10 āϏ⧇āϕ⧇āĻ¨ā§āĻĄ āϏāĻŽā§Ÿ āĻĨāĻžāĻŽā§‡āĨ¤ āϞāĻŋāĻĢāϟ āϖ⧁āϞāϤ⧇ āĻāĻŦāĻ‚ āĻŦāĻ¨ā§āϧ āĻ•āϰāϤ⧇ āĻŽā§‹āϟ 5 āϏ⧇āϕ⧇āĻ¨ā§āĻĄ āϏāĻŽā§Ÿ āϞāĻžāϗ⧇āĨ¤ āĻāĻ• āϤāϞāĻž āĻĨ⧇āϕ⧇ āϤāĻžāϰ āωāĻĒāϰ⧇āϰ āϤāϞāĻžā§Ÿ āϝ⧇āϤ⧇ āϏāĻŽā§Ÿ āϞāĻžāϗ⧇ 1.5 āϏ⧇āϕ⧇āĻ¨ā§āĻĄāĨ¤ āϝāĻĻāĻŋ āχāĻŽāύ 1 āϤāϞāĻž āĻĨ⧇āϕ⧇ 10 āϤāϞāĻžā§Ÿ āϝāĻžā§Ÿ, āϤāĻžāĻšāϞ⧇ āϞāĻŋāĻĢāϟ āĻ•āϤāĻŦāĻžāϰ āĻĨāĻžāĻŽāĻŦ⧇ āĻāĻŦāĻ‚ āχāĻŽāύ 10āĻŽ āϤāϞāĻžā§Ÿ āĻĒ⧌āρāĻ›āĻžāϤ⧇ 2 āĻŽāĻŋāύāĻŋāĻŸā§‡āϰ āĻŦ⧇āĻļāĻŋ āϏāĻŽā§Ÿ āύāĻŋāĻŦ⧇?

One day while going up in the elecator Emon finds that, if lift stops on any floor it stops for 10 seconds. It takes 5 seconds in total to open and close the elevator. To go one floor up, it takes 1.5 seconds. If Emon goes from floor 1 to floor 10 by elevator, at least how many stops will it take Emon to reach the 10th floor in more than 2 minutes.

2. āĻāĻ•āϟāĻŋ āϏ⧇āϟ 𝑨 = {5, 6, 1, 6}, āĻ…āĻĒāϰ āĻāĻ•āϟāĻŋ āϏ⧇āϟ 𝑩 = {đ‘Ĩ| −đ‘Ĩ ∈ 𝑨, 5 − đ‘Ĩ5 ∉ 𝑨} āĻšāϞ, 𝑨 āϏ⧇āĻŸā§‡āϰ āωāĻĒāĻžāĻĻāĻžāύ āϏāĻ‚āĻ–ā§āϝāĻž āϝ⧋āĻ—āĻĢāϞ āĻ•āϤ āĻšāĻŦ⧇?

Given, 𝑨 = {5, 6, 1, 6}, another set 𝑩 = {đ‘Ĩ| −đ‘Ĩ ∈ 𝑨, 5 − đ‘Ĩ5 ∉ 𝑨}. What is the sum of elements of 𝑩?

3. āφāĻĻāĻŋ⧟āύ āϤāĻžāϰ āĻ•āĻžāϛ⧇ āĻĨāĻžāĻ•āĻž 815āϟāĻŋ āĻŽāĻžāĻ°ā§āĻŦ⧇āϞ āĻŦāĻžāĻ•ā§āϏ⧇ āĻ­āϰ⧇ āϰāĻžāĻ–āĻ›āĻŋāϞāĨ¤ āϤāĻžāϰ āĻ•āĻžāϛ⧇ 10, 25, 50 āĻ…āĻĨāĻŦāĻž 100 āĻŽāĻžāĻ°ā§āĻŦ⧇āϞ āϧāĻžāϰāĻŖ āĻ•āϰāϤ⧇ āĻĒāĻžāϰ⧇ āĻāĻŽāύ āĻŦāĻžāĻ•ā§āϏ āĻ°ā§Ÿā§‡āϛ⧇āĨ¤ āϝāĻĻāĻŋ āφāĻĻāĻŋ⧟āύ āĻĒā§āϰāϤāĻŋ āϏāĻžāχāĻœā§‡ āϏāĻ°ā§āĻŦā§‹āĻšā§āϚ 5āϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāϤ⧇ āĻĒāĻžāϰ⧇ āĻāĻŦāĻ‚ āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āϤāĻžāϕ⧇ āĻĒā§‚āĻ°ā§āĻŖāĻ­āĻžāĻŦ⧇ āĻ­āϰāϤ⧇ āĻšāĻŦ⧇, āϤāĻžāĻšāϞ⧇ āφāĻĻāĻŋ⧟āύ āϤāĻžāϰ āĻ•āĻžāϛ⧇ āĻĨāĻžāĻ•āĻž āĻŽāĻžāĻ°ā§āĻŦ⧇āϞāϗ⧁āϞ⧋ āϰāĻžāĻ–āĻžāϰ āϜāĻ¨ā§āϝ āĻ•āĻŽāĻĒāĻ•ā§āώ⧇ āĻ•āϤāϟāĻŋ āĻŦāĻžāĻ•ā§āϏ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāĻŦ⧇?

Adyan is packing marbles into boxes. He has boxes that can hold 10,25,50 or 100 marbles. If Adyan can use at most 5 boxes of each size and must fill each box with marbles he uses, what is the minimum number of boxes he requires to pack all the marbles to pack 815 marbles?

4. āĻ…āύāĻŋāĻ¨ā§āĻĻā§āϝ āĻāĻŦāĻ‚ āĻĒā§āϞāĻžāĻŦāύ āĻĻ⧁āχ āĻŦāĻ¨ā§āϧ⧁ āϏāĻ‚āĻ–ā§āϝāĻžāϤāĻ¤ā§āĻ¤ā§āĻŦ āύāĻŋā§Ÿā§‡ āĻ…āύ⧇āĻ• āφāĻ—ā§āϰāĻšā§€āĨ¤ āϤāĻžāϰāĻž āĻāĻ•āĻĻāĻŋāύ āωāĻ­ā§Ÿā§‡ āĻāĻ•āϟāĻŋ āĻ•āϰ⧇ āϧāύāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āĻŦāĻžāĻ›āĻžāχ āĻ•āϰāϞ⧋ āĻāĻŦāĻ‚ āϏ⧇āχ āĻĻ⧁āϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻž āĻĻāĻŋā§Ÿā§‡ āĻāĻ•āϟāĻŋ āĻœā§‹ā§œāĻž āĻŦāĻžāύāĻžāϞ⧋ āĨ¤ āĻ…āύāĻŋāĻ¨ā§āĻĻā§āϝāϰ āĻŦāĻžāĻ›āĻžāχ āĻ•āϰāĻž āϏāĻ‚āĻ–ā§āϝāĻžāϟāĻŋāϰ āĻāĻ•āϟāĻŋ āϗ⧁āύāĻ¨ā§€ā§Ÿāϕ⧇āϰ āϏāĻ‚āĻ–ā§āϝāĻž āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻŽā§ŒāϞāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āĻĻā§āĻŦāĻžāϰāĻž āύāĻŋāσāĻļ⧇āώ⧇ āĻŦāĻŋāĻ­āĻžāĻœā§āϝ āύ⧟āĨ¤ āĻĒā§āϞāĻžāĻŦāύ⧇āϰ āĻŦāĻžāĻ›āĻžāχ āϏāĻ‚āĻ–ā§āϝāĻžāϰ āϏāĻŽāĻˇā§āϟāĻŋ āĻŽāĻžāύ 100āĨ¤ āĻāĻ•āϰāĻŽ āĻ•āϟāĻŋ āĻ­āĻŋāĻ¨ā§āύ āĻ­āĻŋāĻ¨ā§āύ āĻœā§‹ā§œāĻž āϤāĻžāϰāĻž āĻŦāĻžāύāĻžāϤ⧇ āĻĒāĻžāϰāĻŦ⧇ āϤāĻžāϰ āϏāĻ‚āĻ–ā§āϝāĻž āύāĻŋāĻ°ā§āϪ⧟ āĻ•āϰ⧋āĨ¤

Anindya and Plabon are very interested in number theory. One day they both chose a positive integer each and made a pair with them. The number of factors of the number that Anindya chose was not divisible by the smallest prime number. Plabon chose such a number which was a factor of the number that Anindya chose. The highest value of the number that they both chose was 100. Find the number of different pairs that they can make.

5. 𝑛 āĻāϰ āĻāĻ•āϟāĻŋ āĻŽāĻžāύ āĻĨ⧇āϕ⧇ 2^8 + 2^{11} + 2^n āĻāĻ•āϟāĻŋ āĻĒā§‚āĻ°ā§āĻŖāĻŦāĻ°ā§āĻ— āϏāĻ‚āĻ–ā§āϝāĻž āĻšāϤ⧇ āĻĒāĻžāϰ⧇ āĻ•āĻŋāύāĻž, āϤāĻŦ⧇ 𝑛 āĻāϰ āĻŽāĻžāύ āϕ⧀ āĻšāĻŦ⧇?

If 2^8 + 2^{11} + 2^n is a perfect square number, then determine the value of 𝒏 where n is a natural number

6. āĻĒāĻžā§Ÿā§‡āϞ āĻāĻ•āϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻž āϰ⧇āĻ–āĻžāϰ 0 āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϤ⧇ āĻĻāĻžāρ⧜āĻŋā§Ÿā§‡ āφāϛ⧇āĨ¤ āϏ⧇ 2 āϘāϰ āĻĄāĻžāύ⧇ āĻŦāĻž āĻŦāĻžāĻŽā§‡ āϞāĻžāĻĢ āĻĻāĻŋāϤ⧇ āĻĒāĻžāϰ⧇āĨ¤ āĻŽā§‹āϟ 2022āϟāĻŋ āϞāĻžāĻĢ āĻĻ⧇āĻ“ā§ŸāĻžāϰ āĻĒāϰ, āĻĒāĻžā§Ÿā§‡āϞ āĻ•āϤāϟāĻŋ āĻ­āĻŋāĻ¨ā§āύ āĻĒā§Ÿā§‡āĻ¨ā§āĻŸā§‡ āĻ…āĻŦāĻ¸ā§āĻĨāĻžāύ āĻ•āϰāϤ⧇ āĻĒāĻžāϰ⧇?

%Focuse keyword%

Payel is standing at point 0 on a number line. He can move a maximum of 2 steps right or left per jump. After 2022 consecutive jumps at how many different points on the number line can Payel be?

7. āϚāĻŋāĻ¤ā§āϰ⧇ 𝑨B||đ‘ŦF||đ‘ĒD, Δ𝑩EC āĻāĻ•āϟāĻŋ āϏāĻŽāĻŦāĻžāĻšā§ āĻ¤ā§āϰāĻŋāϭ⧁āϜāĨ¤ đ‘ŦF, đ‘ĒM āĻāĻŦāĻ‚ BN āĻšāϞ āĻ¤ā§āϰāĻŋāϭ⧁āĻœā§‡āϰ āϤāĻŋāύāϟāĻŋ āĻŽāĻ§ā§āϝāĻŽāĻžāĨ¤ āϝāĻĻāĻŋ, ∆BEC āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ 3√3 āĻšā§Ÿ, āϤāĻžāĻšāϞ⧇ 𝑨M + đ‘ĩD =?

BD Math Olympiad regional questions 2023

In the figure, 𝑨B||đ‘ŦF||đ‘ĒD, Δ𝑩EC is an equilateral triangle, đ‘ŦF, đ‘ĒM and 𝑩N are the three medians of the triangle. If the area of, Δ𝑩EC is 𝟑√𝟑,then 𝑨M + đ‘ĩD =?

8. āĻāĻ•āĻĻāĻŋāύ āĻ…āύāĻŋāĻ¨ā§āĻĻā§āϝ āĻĢā§āϝāĻžāĻ•ā§āĻŸā§‹āϰāĻŋ⧟āĻžāϞ āύāĻŋā§Ÿā§‡ āĻ—āĻŦ⧇āώāĻŖāĻž āĻ•āϰ⧇āĻ›āĻŋāϞ⧋āĨ¤ āĻ…āύāĻŋāĻ¨ā§āĻĻā§āϝ 10! āϕ⧇ āĻ•ā§Ÿā§‡āĻ•āϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻžāϰ āĻĢā§āϝāĻžāĻ•ā§āĻŸā§‹āϰāĻŋ⧟āĻžāϞ⧇āϰ āϝ⧋āĻ—āĻĢāϞ āĻšāĻŋāϏ⧇āĻŦ⧇ āĻĒā§āϰāĻ•āĻžāĻļ āĻ•āϰāϤ⧇ āϚāĻžāχāϞ⧋ āĻāχ āĻļāĻ°ā§āϤ⧇ āϝ⧇ āĻŦā§āϝāĻŦāĻšā§ƒāϤ āĻĒā§āϰāϤāĻŋāϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻž 10 āĻāϰ āĻšā§‡ā§Ÿā§‡ āϛ⧋āϟ āĻšāĻŦ⧇āĨ¤ āĻāĻ•ā§āώ⧇āĻ¤ā§āϰ⧇ āĻāĻ•āχ āϏāĻ‚āĻ–ā§āϝāĻžāϰ āĻĢā§āϝāĻžāĻ•ā§āĻŸā§‹āϰāĻŋ⧟āĻžāϞ āĻāĻ•āĻžāϧāĻŋāĻ• āĻŦāĻžāϰ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰāĻž āϝāĻžāĻŦ⧇ āĨ¤ 10! = a! + b! + c! = … + n!āĨ¤ āĻāĻ­āĻžāĻŦ⧇ āĻĒā§āϰāĻ•āĻžāĻļ āĻ•āϰāϞ⧇ (a + b + c + … + n) āĻāϰ āĻŽāĻžāύ āύāĻŋāĻ°ā§āϪ⧟ āĻ•āϰ⧋āĨ¤

One day Anindya was experimenting with factorials. Anindya wanted to express 10! as the sum of factorial of some numbers in such a way that each number used is less than 10. The factorial of the same number can be used more than once. If it is expressed in the following way: 10! = a! + b! + c! = … + n! then find the value of (a + b + c + … + n).

BdMO 2023 All Regional Questions

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