IBM social recruitment test questions and answers

1. an even long straight pipe with four white balls and four black balls open at both ends. The diameter of the ball and the diameter of the opening at both ends are equal to the diameter of the tube, the white and black balls are arranged at wwwwwwbbbb. You do not need to take out any balls to change the arrangement to bbwwwwbb.

2. A snail can climb from the bottom of the well to the wellhead. Every day, a snail can go to bed at night. A snail can climb 3 feet in one night, but it will fall 2 feet in the daytime, 10 feet in depth. I asked a few days if the snail bait could climb out.

3. Draw up to 1999 straight lines on a plane to divide the plane into several parts.

4. A person who lives on a small island in the Pacific Ocean does not want to be disturbed by outsiders. One day an explorer arrives on the island and is captured by the natives. the priests of the natives tell him, before you die, you can have a chance to leave a sentence. If this sentence is true, you will be burned to death. If it is false, you will be split by five horses. How can poor explorer survive?

5. How do I plant four trees with the same distance between any two trees?

6. after the competition, 27 small athletes are thirsty, go to the store to buy drinks, drink out for promotion, and use three empty bottles to change one, how many bottles of drinks can they sell at least to ensure one person and one bottle?

7. there is a mountain with a temple on the mountain. There is only one way to go from the temple on the mountain to the foot of the mountain. Every Monday morning at, there is a smart little monk who goes down the mountain to save his fortune, at on Tuesday, I went back to the Temple from the foot of the mountain. The speed of the monk's mountain was arbitrary. In every round trip, he can always arrive at the same point on the mountain road on Monday and Tuesday, for example, he once discovered that he had been to 3/4 of the mountain foot on Monday at and Tuesday.

8. There are two unevenly distributed fragrances, each of which is burned for an hour. How can you determine a period of 15 minutes?

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1. Connection

2. After 8 days, you will not go to bed until the next day.

3. Part = n + 1 = 1999 + 1 = 2000

4. "I requested to be split by five horses ",

5. bundle them together. The answer is yes. I guess the tree will not survive.

6. 20 bottles, with 1 lid left.

7. Because one is going up the hill and the other is going down the hill.

8. One head is burned together.

The burning time of the two ends should be 30 minutes.

At this time, there should be a burning drop with a length that can be burned for 30 minutes.

Then it can be burned together for 15 minutes.