Start your brain! Exercise wisdom questions every Monday 4

I. Mathematical Ability
　　
1. Two turtles race
Two turtles race together. When turtles reached the finish line of 10 meters, turtles ran to 9 meters. Now, if you want to let the turtle's start line fall back by one meter, then the two turtles start the competition at the same time and ask if both turtles reach the end at the same time?
A: Turtles come first
　　

2. TV price
Mike was busy and decided to ask Nick to help him temporarily. A one-year period is required, and the compensation for one year is USD 600 with a TV set.
However, after Nick finished his work for seven months, he had to leave Mike in an emergency and asked Mike to pay him the money and TV he deserved. As TV sets cannot be broken up and paid to him, Nick got $150 and a TV set.
Now, how much is the TV set worth?
Answer: 480
　　

3. Three weights are called things.
There are three types of standard weights: 1g, 3G, and 9G. How many different pieces of weight can be called? During weighing, the thing to be called and the known standard weight can be placed on either of the two disks of the balance at will. In addition, each weight has only one weight and cannot be copied.
A: One of 13 grams can be weighed.
One gram of items, one gram of weight on one side, and one item on the other side
2 grams of items put 3 grams of weight on one side, and 1 gram of weight on the other side
3 grams of items, put 3 grams of weight on one side, and put items on the other side
4 grams of items, one gram of weight and three grams of weight, while putting items
5 grams of items, 9 grams of weight, 1 gram of weight and 3 grams of weight + item
6 grams of items, 9 grams of weight on one side, and 3 grams of weight on the other side
7 grams of items, 9 grams of weight + 1 gram of weight, while putting items + 3 grams of Weight
8 grams of items, 9 grams of weight on one side, and 1 gram of weight on the other side
9 grams of items, 9 grams of weight, while putting items
10 grams of items, 1 gram of weight + 9 grams of weight, while putting items
11 grams of items, 9 grams of weight + 3 grams of weight, while putting items + 1 gram of Weight
12 grams of items, 9 grams of weight + 3 grams of weight, while putting items
13 grams of items, 1 gram of weight + 9 grams of weight + 3 grams of weight, while putting items
　　

4. Meters
There is a weight of 9 kilograms and 50 grams and 200 grams respectively. How can I weigh only three times on a daily basis and claim 2 kilograms of meters?
A: For the first time, you do not need to use a weight. You can place an average of 9 kilograms of rice at both ends of the balance to produce 4.5 kilograms of rice. For the second time, you can use the same method to produce 2.25 kilograms of rice; for the third time, use a weight of 200 + 50 grams to extract 2.25 kilograms of rice from 0.25 kilograms of rice. The remaining two kilograms of rice are OK!
　　

5. Isha Bella fashion boutique house
A women's winter dress was recently purchased from Italy in the Isha Bella fashion boutique house in New York. The purchase price of this dress is the sales price marked by the store.
Out of the fact that the product was not sold out within half a month, the female boss cut the price and was quickly bought by a pretty lady. The female boss made a profit of 400 yuan.
What is the purchase price of this upscale Women's winter clothes?
Answer: 5000

6. Weighing canned goods
Deliveryman A, who works for A can factory, sent 10 boxes of canned pineapple to A food company. Each can has a weight of 800 grams and 20 containers.
Just as he had delivered the goods and was about to return to the factory, he received a call from the factory, saying that one of the 10 boxes had been mixed into the defective product due to a machine problem, each can lacks 50 grams of weight and the deliveryman needs to send the box back to the factory for replacement. But how can we find out which box is defective? The most important thing is the scale, but it is not at hand.
At this moment, he suddenly found that not far from the road there is a machine automatically weigh the weight, that is, invested in 1 Yuan coin can weigh a weight. There was just a 1-dollar coin in his pocket. Of course, only one energy. So how should he make full use of this only one opportunity to find the box of products that do not meet the specifications?
Sort the cans in a row, take the cans from left to right (and vice versa), take one in the first box, two in the second box, and so on. Take nine in the ninth box, and ten in the tenth box. All of them are weighed together. If 50 grams are less, the first case is unqualified. If 100 grams are less, the second case is unqualified. Similarly, there are 50 grams less, that is, the number of boxes is unqualified.
　　

7. climb the stairs
A gentleman is going to work on the second floor on the 10 floor. Unfortunately, he is in the midst of a power outage and cannot use the elevator. He can only walk upstairs. If it takes 48 seconds for him to climb to the fifth layer from the second layer, how many seconds does it take to go to the second layer at the same speed?
Answer: 48/3*7 = 112

8. The flight attendant allocates items
On a plane, there is an aisle in the middle, with seats on both sides, and three people in each row. Two flight attendants A and B are responsible for one side and each passenger is assigned travel items.
At the beginning, A gave 6 copies to the passengers on the right. At this time, B came to her and said that A should be responsible for the passengers on the left. So A began to issue the goods again on the left, B went on to issue the items to the remaining passengers on the right, and then sent 15 copies to A, and the last two ended their work at the same time.
Q: Who sent more messages from A and B? How many copies are sent? --- By caoxu Add the condition "the number of seats on both sides is equal"
Answer: B, (15-6) * 2 = 18