1. There are two unevenly distributed incense sticks. The time it takes for the incense to burn is one hour. What method can you use to determine a 15-minute period?
2. A manager has three daughters. The ages of three daughters are equal to 13. The ages of three daughters are equal to the manager's own year.
Age, a subordinate already knows the manager's age, but still cannot determine the age of the manager's three daughters. At this time, the manager said that there is only one woman
My son's hair was black, and then the subordinate knew the age of the manager's three daughters. What are the ages of the three daughters?
Why?
3. Three people went to stay in a hotel and stayed in three rooms, each room was $10, so they paid the boss a total of $30.
The next day, the boss thought that only $25 for three rooms was enough, so he asked me to return $5 to the three guests.
Unexpectedly, I was greedy and only returned $1 per person, and secretly took $2 himself. This would mean that each of the three guests spent nine yuan.
So the three of them spent a total of $27, and the younger brother took over $2, which was a total of $29. But the three of them paid a total of $30
So what about $1?
4. There are two blind people who have bought two pairs of black socks and two pairs of white socks. The fabric and size of the eight pairs of socks are exactly the same.
And every pair of socks has a piece of trademark paper connected. The two blind men accidentally mixed eight pairs of socks together. How can each of them get it back
What about two pairs of black socks and white socks?
5. One train left Los Angeles and headed straight for New York at 15 kilometers per hour, and another train went from New York at 20 kilometers per hour.
Make an appointment to Los Angeles. If there is a bird, start at a speed of 30 km/h and two trains at the same time, start from Los Angeles,
After getting to another car, fly back and forth on the two trains in turn until the two trains meet. How long has this little bird flew
distance?
6. You have two jars, 50 red pinballs, 50 blue pinballs, randomly select a jar, randomly select a pinball and put it in the jar
Zi, how can I give the red pinball the greatest chance to choose? What is the exact chance of getting a red ball in your plan?
7. You have four jars of pills, each pill has a certain weight. The contaminated pills are weights that are not contaminated + 1. Weigh only
Once, how to tell which jar of medicine is contaminated?
8. You have a bucket of jelly, including %%, green and red. Close your eyes and grab two jelly of the same color. How many to grab
You can be sure that you have two jelly of the same color?
9. For a batch of lights with a number of 1 to 100 and all switches facing upward (on) the following: turn on the switch once in the opposite direction of the multiple of 1;
The switch is dialed again in the opposite direction of the multiple; the switch is dialed again in the opposite direction of the multiple of the multiple of the multiple of the multiple of the multiple... Question: Finally, the number of the light in the off state is the off state.
10. Imagine you in front of the mirror. Why can the images in the mirror be reversed left and right, but not up and down?
11. A group of people held a dance party, and each of them wore a hat on their heads. There are only two types of hats, black and white, and at least one black one is on it. Everyone can watch it
When you see the color of other people's hats, you can't see your own. The host first lets everyone see what hats are on their heads, and then close them
Light, if someone thinks he is wearing a black hat, he slaps himself in the face. The first time I turned off the lights, there was no sound. So turn on the light again,
Everyone read it again, and it was still silent when the lights were turned off. It was not until the third time that the lights were turned off, and there was a slap in the face. ask
How many people wear black hats?
12. The two rings have radii 1 and 2 respectively. The small circle is around the big circle within the big circle. How many weeks has the small circle turned itself? If it's big
On the outside of the circle, how many weeks does the small circle turn itself?
13. One bottle of soda for 1 yuan. After drinking it, change to one bottle of soda for two empty bottles. Question: Do you have 20 yuan, how many bottles of soda can you drink at most?
2. A manager has three daughters. The ages of three daughters are equal to 13. The ages of three daughters are equal to the manager's own year.
Age, a subordinate already knows the manager's age, but still cannot determine the age of the manager's three daughters. At this time, the manager said that there is only one woman
My son's hair was black, and then the subordinate knew the age of the manager's three daughters. What are the ages of the three daughters?
Why?
3. Three people went to stay in a hotel and stayed in three rooms, each room was $10, so they paid the boss a total of $30.
The next day, the boss thought that only $25 for three rooms was enough, so he asked me to return $5 to the three guests.
Unexpectedly, I was greedy and only returned $1 per person, and secretly took $2 himself. This would mean that each of the three guests spent nine yuan.
So the three of them spent a total of $27, and the younger brother took over $2, which was a total of $29. But the three of them paid a total of $30
So what about $1?
4. There are two blind people who have bought two pairs of black socks and two pairs of white socks. The fabric and size of the eight pairs of socks are exactly the same.
And every pair of socks has a piece of trademark paper connected. The two blind men accidentally mixed eight pairs of socks together. How can each of them get it back
What about two pairs of black socks and white socks?
5. One train left Los Angeles and headed straight for New York at 15 kilometers per hour, and another train went from New York at 20 kilometers per hour.
Make an appointment to Los Angeles. If there is a bird, start at a speed of 30 km/h and two trains at the same time, start from Los Angeles,
After getting to another car, fly back and forth on the two trains in turn until the two trains meet. How long has this little bird flew
distance?
6. You have two jars, 50 red pinballs, 50 blue pinballs, randomly select a jar, randomly select a pinball and put it in the jar
Zi, how can I give the red pinball the greatest chance to choose? What is the exact chance of getting a red ball in your plan?
7. You have four jars of pills, each pill has a certain weight. The contaminated pills are weights that are not contaminated + 1. Weigh only
Once, how to tell which jar of medicine is contaminated?
8. You have a bucket of jelly, including %%, green and red. Close your eyes and grab two jelly of the same color. How many to grab
You can be sure that you have two jelly of the same color?
9. For a batch of lights with a number of 1 to 100 and all switches facing upward (on) the following: turn on the switch once in the opposite direction of the multiple of 1;
The switch is dialed again in the opposite direction of the multiple; the switch is dialed again in the opposite direction of the multiple of the multiple of the multiple of the multiple of the multiple... Question: Finally, the number of the light in the off state is the off state.
10. Imagine you in front of the mirror. Why can the images in the mirror be reversed left and right, but not up and down?
11. A group of people held a dance party, and each of them wore a hat on their heads. There are only two types of hats, black and white, and at least one black one is on it. Everyone can watch it
When you see the color of other people's hats, you can't see your own. The host first lets everyone see what hats are on their heads, and then close them
Light, if someone thinks he is wearing a black hat, he slaps himself in the face. The first time I turned off the lights, there was no sound. So turn on the light again,
Everyone read it again, and it was still silent when the lights were turned off. It was not until the third time that the lights were turned off, and there was a slap in the face. ask
How many people wear black hats?
12. The two rings have radii 1 and 2 respectively. The small circle is around the big circle within the big circle. How many weeks has the small circle turned itself? If it's big
On the outside of the circle, how many weeks does the small circle turn itself?
13. One bottle of soda for 1 yuan. After drinking it, change to one bottle of soda for two empty bottles. Question: Do you have 20 yuan, how many bottles of soda can you drink at most?