An overseas Chinese crossed the river from east to west, and it took him five minutes. There is a pavilion in the middle of the bridge. There is a night watchman in the pavilion. He comes out every three minutes. When you see someone passing by, tell him to go back and not go there. A clever man who crossed the bridge from east to west thought of a clever way and finally crossed the bridge.
Excuse me: How did the wise man think of crossing the bridge?
And a few live rabbits.
In order to clean the rabbit cage, someone put four live rabbits and four tigers in a cage. After cleaning two rabbit cages, he wants to put the rabbit back in the rabbit cage. How many live rabbits are there at this time?
How to send famous paintings
Grandpa has a famous painting, which is rolled to 1 10 pear and bamboo. He wants to send it to his distant uncle, but the post office only allows items less than one meter in length. Can you find a way to send this famous painting there?
How many photos per person?
When I graduated from primary school, Ali and Ah Fu gave each other a photo. How many photos did they give each other?
5 * * * shook hands several times.
At the science and technology conference, three old scientists met and shook hands cordially. How many times did they shake hands?
6 Beatty's age
Betty is very sensitive about her age. Forty years ago, when people asked her how many years she had lived, she always recited the following poems as an answer:
Five times seven plus seven times three, plus my age, this number is twenty times less than my age, and it is six times nine plus four.
When Betty recited this poem for the first time, she was undoubtedly accurate. But can you tell me how old she is now?
7 kaixinbao happy town
Tired Willie is a migrant worker. He has been in Happy Town for a long time, and now he is preparing to change places and work in Happy Fort. At the same time, travel-stained Rhodes has just set off from Happy Castle and walked in the opposite direction with him. The two met on the road and shook hands tightly to say hello. In this position, Willie walked 18 miles more than Rhodes. After the two sides shook hands and said goodbye, it took Willie 13 and 1/2 hours to reach the destination Happy Castle, while it took travel-stained Rhodes 24 hours to reach Happy Town.
Suppose they all move at a constant speed. How far is it from Happy Castle to Happy Town?
Answer: The distance from Happy Town to Happy Fort is 126 miles.
1 answer: the wise man thought of a way to cross the bridge from east to west. Two and a half minutes later, he turned around and walked east. The guard came out and ordered him to go back, so that he could turn around and go west, so that he could cross the bridge.
Answer: Because tigers eat rabbits, no rabbits are alive.
Answer: Make a one-meter-long box (with appropriate length and width) and put the picture in it obliquely.
4 answer: 6.
Answer: Beatty was 18 years old 40 years ago, so now she is 58 years old.
7 t= 18 v 1=4 v2