Answer: E sits between A and B, and A and B are her relatives and friends.
There are 692 infantry in a fortress. Every four people stand in a horizontal row, walk forward at intervals of 1 meter 1, and walk 86 meters per minute. Now we must cross this 86-meter-long bridge. How many minutes does it take from the first row to the last row?
Answer: 3 minutes.
3. A farmer keeps 9 sheep, 7 pigs and 5 cows. In terms of price, two sheep can be exchanged for a pig, and five sheep can be exchanged for 1 cow. He wants to give these cows, sheep and pigs to his three sons. Not only will no one get the same number of livestock, but their value will be the same. Can you come up with a distribution plan?
Answer: the eldest son points 1 cow, 5 pigs, 1 sheep; The second son is divided into 2 cows, 1 pig and 4 sheep; The third son is divided into 2 cows, 1 pig and 4 sheep.
4. Distance between two cars 1500m. Suppose the front car is driving at a speed of 90km/h and the rear car is chasing at a speed of 144km/h, how far apart are the two cars in one second when they collide?
Answer: Distance15m.
There are two companies, A and B, recruiting managers. The annual salary of a company is 6,543,800 yuan, and the salary is raised once a year, with a salary increase of 20,000 yuan each time; Company B has a salary of 50,000 for half a year, with a salary increase of 5,000 for half a year. Which company pays more?
Answer: Go to Company B to earn more money.
6. The famous Russian mathematician lomonosov borrowed the book Mathematical Principles from his neighbor. The neighbor said to him, "You help me chop wood 10 days, and I will give you the book and give you 20 rubles." As a result, he only chopped firewood for seven days. After the neighbor gave him the book, he paid another 5 rubles. What is the price of the book Principles of Mathematics?
A: The price of this book is 30 rubles.
7. The bottle contains1000g of alcohol with the concentration of 15%. Now pour 100 grams of 400 grams of alcohol A and B into the bottle, and the concentration of alcohol in the bottle becomes 14%. It is known that the concentration of alcohol A is twice that of alcohol B. How to find the concentration of alcohol A?
Answer: 20%
Besides, there are few interesting math problems in this website. You can have a look:/_ hot/intelligence/sxqt/index2.htm.