Interview question from a well-known company – eight billiards balls
Thread Content
There are 8 balls with the same outer diameter, one of which is slightly heavier than the others. Without using weights, how many times do you need to weigh it at the minimum to find this ball? 【Haixin Chemical Cup ★ Haichuan Chemical: Spring Has Arrived】Event Guidelines: (1) Event period: Participation is allowed from March 10 to May 20, 2017, with the evaluation period running from May 21 to May 31. (2) Posting location: The tourism section of the forum. (3) Requirements: Share pictures of landscapes, flowers and plants from various places, as well as thoughts on spring and the joy that comes with its arrival. A minimum of four pictures are required per post; it’s preferable to have one post per thread along with accompanying descriptive text, and series of posts are encouraged. Don’t send all the pictures at once for one floor; it’s not convenient for sharing. In the “Leisure Area – Self-driving Tours” section, posts related to the “Travel” theme can be created (in the form of pictures of people, scenery, food, etc.); sticky notes are not valid for this purpose. Posting format: 【Haixin Chemical Cup ★ Haichuan Chemical: Spring Has Arrived】 + number + your own title. (4) Prizes for participants: Those who take part in the activity will receive 1 Haichuan coin (subject to meeting the activity requirements), as well as flowers. For the best posts selected by the event organizers this year, the post authors will also receive an additional reward of “flowers + Haichuan coins”. In total, 5 first prizes, 20 second prizes, and several excellence awards will be given; the winners of the first and second prizes will receive tangible prizes! For more information on the prizes for the 【Haixin Chemical Cup ★ Haichuan Chemical: Spring Has Arrived】 event, please visit the leisure section of the “Haichuan Chemical Forum”. *The [Haichuan Chemical Forum] retains ultimate authority over the interpretation of this event. In spring, you share happiness; in autumn, you will reap a thousand joys. Everyone is welcome to participate and share happiness. Happy HaiChuan is waiting for you!
If the tray is large enough, it needs to be weighed 3 times. If a tray can hold only one item, it will take 4 times.
Do you really have to use a scale? Try holding two at a time by hand and you’ll see: lol
It means slightly heavier, that is, you can’t feel the difference. :Lol, unless you’re super sensitive.
Then it can be done in three times: lol
Then you need big hands so you can carry more. :lol
One can find a deeper saltwater pool and throw all 8 balls in together; the one that reaches the bottom first is the heaviest.
Your major in analysis has chemical engineering characteristics