Answers to smart questions are published!

Title post: http://www.cnblogs.com/junzhongxu/archive/2009/06/03/1495284.html

01. Question difficulty: simple
A hunter came home with a sheep, a wolf and a cabbage and met a river on the road. There is only one boat by the river, but the boat is too small. At a time, it can only carry hunters and other things across the river. But when a hunter is absent, the wolf eats sheep and the goat eats cabbage. How can we safely transport wolves, sheep, and cabbage across the river?

A: Let's transport the sheep first, and the hunters will transport the wolf back. The hunters will hold the sheep back, the hunters will hold the cabbage back, And the hunters will return. Finally, they will hug the sheep.

02. Question difficulty: Moderate
There are 10 sugar in the teacher's box, and there are 10 students.
The teacher said: each of you will have a sugar and one left in the box. How can this problem be solved?

A: each person has a sugar, and the last box is connected to a person.

03. Question difficulty: difficult
Xiao Ming and Xiao Hua bought 10 Jin of honey and packed it in a large bottle. to divide the honey equally, there are only two empty bottles, one containing exactly 7 kg, and the other containing exactly 3 kg. how can we split honey in the simplest way.

Answer: 1. Fill the last three bottles with water, and then fill the remaining seven bottles with water.
2. Fill the Three-catty bottle with water, and then pour it into the seven-catty bottle. At this time, there are 6 catties of honey in the seven-catty bottle.
3. Fill the three-pound bottle with water, and then pour it into the seven-pound bottle. When the seven-pound bottle is full, there will be 2 of honey in the three-pound bottle, and the seven-pound bottle will have exactly 7.
4. Put all the honey in the 7-kg bottle back to the 10-kg bottle, then there is 8 in the 10-kg bottle, and the 2-kg honey in the 3-kg bottle is poured into the 7-kg bottle.
5. Fill 3 of honey in 10 kg bottle with 3. Then pour the 3 kg honey into 7 kg bottle.
At this time, the 7 kg bottle and 10 kg bottle each have 5 kg

04. Question difficulty: simple
A hunter saw a Huang Ying in the forest. He wanted
Huang Ying told the hunter that there were five flowers behind the big tree, four of which were real flowers and I changed. Can you find me?
Then Huang Ying becomes a flower.
Can you find it?

A: In the early morning, the flowers and plants for the night are stained with dew, But the yellow Ying has just changed.

05. Question difficulty: Moderate
There are 100 balls, one of which is of low quality,
There is only one balance now. You should try to find the ball a few times.

A: Because the question is asked at least a few times, the answer is: Take two balls at a time, maybe one of them is a light ball. This possibility is small, but it also exists.

06. Question difficulty: difficult.
I don't know how deep a well is. I don't know how long a rope is.
Fold the rope to 3 fold and drop the bottom hole at one end. When the bottom of the rope reaches the bottom hole, the top is 1 foot lower than the wellhead.
If you fold the rope to 2 folds, the upper end is 6 feet higher when the lower end reaches the lower end of the well.
Do you know how deep the well is and how long the rope is?

Answer: The well depth is 15 feet long and the rope length is 42 feet long.

07. Question difficulty: simple
Three hunters crossed the river with a black bear and two brown bears.
The ship is very small. Only two people or two bears can be carried at a time, or one person or one bear can cross the river.
All three hunters will go boating. The black bear is trained by hunters and also goes boating.
But once the number of bears exceeds the number of people, the bears will eat people.
How to safely cross the river

A: The Black Bear first ships a brown bear across the river. The black bear is rowing back to cross the river. The black bear is rowing back and the Two Tears are rowing across the river, A hunter brings a brown bear back, a hunter ships the black bear across the river, a hunter carries a brown bear back, and the black bear rowing back two times to cross the river

08. Question difficulty: Moderate
Xiao Ming, Xiao Hua, and Xiao hongsan fish.
After the fishing, someone asked them if they had caught many fish today.
James said a total of 22 articles.
I have two more fish and three more fish than I have.
Do you know how many hops each of them has?

Answer: 5, 7, 10

09. Question difficulty: difficult
There are four ships. The time required for the four ships to cross-region varies. The first ship takes 1 minute, the second ship takes 2 minutes, and the third ship takes 5 minutes, ship 4 takes 10 minutes.
How can we use the fastest time to route four ships to the opposite side?
[There is only one person rowing a boat. You can drag up to two ships at a time, but you must drag them back.]

Answer: 17 minutes

10. Question difficulty: difficult
There are 10 cases of canned food. These 10 cases of canned food are 20 cases per case, each containing 1 kg.
But there is a box, each box only has 9 two.
Now there is only one scale, and only one scale is allowed.
, We need to find out the box with problems.
[Premise: You can't say you need to use your hands to raise your hand.]

A: Enter the number of the box as 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10.
Take one box from the first and two boxes on the second ...... ten boxes on the 10. 55 boxes in total
Put the boxes out on the scale, and check the number. When 10 boxes are 1 kg per box, 55 boxes should be 55, the question says that there is a box of 9 or two each. From the method of getting the box just now, if there is one box on the first and only one box on the first, the display number should be 54.9, if it is 2, 3, 4 .... the numbers shown on the 10th are 54.8, 54.7, 54.6, 54.5, 54.4, 54.3, 54.2, 54.1, and 54 in sequence.

How many questions have you answered ???