One day, Fangfang, Mingming and Lili were playing together. After playing for a while, they broke out in a sweat. Fangfang said, "Let's buy sorbet to eat." As he spoke, he took out a handful of coins from his pocket. At first glance, they were all nickels. Yan Mingming also took out a handful of coins from his pocket, all of which were 2 cents, and also took out a force, all of which were 1 cent. Three people put the money together and counted it. One * * * is 1 yuan.

"How much money did each of us bring?" Li Li asked.

"I can't remember." Fangfang said, "I only remember that my coin was twice as big as Mingming's."

"I have exactly twice as many coins as I do." Clearly said.

"Let's share a flower." Fangfang grabbed the coin and went to buy sorbet.

Lily is thinking, how much money did each of us bring?

Card problem

On Sunday, Linlin went to Sensen's house and saw Sensen fiddling with five cards on the table. These five cards

The film says 4, 5, 6,+and = respectively.

Lin Lin asked, "What are you wearing?"

Sensen said, "I want to put these five cards together into an equation."

Lin Lin said, "Isn't it easy?"

He set it up as soon as he said it, but he couldn't set it up for a long time. 4+5, 4+6 and 5+6 all exceed the maximum number, and 6, 6-5 and 6-4 are not enough for the minimum number 4.

"This is impossible. This equation will never hold. " Lin Lin said.

"You can put it in." Sensen said, and put a formula on the table. It was an equation.

Little friend, do you know what Sensen said?

When shall we meet?

Obana and MengMeng quarreled over a trivial matter, and neither of them spoke to anyone. The monitor Xiaohong wanted to ask the two of them to talk together, but no one went. This really worries Xiaohong. What can we do to keep them together? It suddenly occurred to her that everyone in Obana and MengMeng has the habit of running in the morning, and they are all on the path next to the campus. It's 6 o'clock in the morning, but Xiaohua comes every three days and MengMeng comes every five days. Today is 654381October 3rd. Both Obana and MengMeng went this morning. Xiaohong knows that MengMeng will leave tomorrow, so when can we meet next time? Xiaohong calculated the time when they met and went that morning, so she met them both at the same time. She called them together and told them the truth of unity. They all realized that there was something wrong with their practices and made self-criticism. From then on, they became good friends. Children, can you guess the date when Obana MengMeng met on the path?

Galileo's mathematical problems

Galileo is a famous scientist in Italy. Once he went to the racecourse to watch horse races and came up with a math problem. Here's the question. There is a 600-meter-long happy track at the racecourse. Now there are three horses, A, B and C. A can run 2 laps a minute, Otsuichi can run 3 laps a minute and C can run 4 laps a minute. If these straight horses run side by side on the same starting line and in the same direction, how many minutes will it take for these three horses to get back on the starting line?

Clever trade-off

Mr. Zhao, Mr. Qian and Mr. Sun all weigh about 60 Jin, but I don't know the exact figure. Now there is only 100 kg weight and weighbridge. Is there any way to weigh them?