One day, a customer came to boss Wang's shop and bought this product with 100 yuan. Boss Wang went to a neighbor's house to change 100 yuan because he didn't have any change. Then I found the customer 2 1 yuan. The next day, the neighbor said that the money that Boss Wang gave him yesterday was fake, so Boss Wang returned 100 yuan to the neighbor. Q: How much did Boss Wang lose?

One day, a young man came to a shoe store and bought a pair of shoes. The cost of this pair of shoes is 15 yuan, and the list price is 2 1 yuan. As a result, the young man took out 50 yuan to buy this pair of shoes. Shoe store had no change at that time, so 50 yuan changed 50 yuan's change from the neighborhood and gave it to Yang 29 yuan. But later, the neighborhood found that 50 yuan was a counterfeit banknote, and the shoe store had no choice but to return it to the neighborhood 50 yuan.

The question now is: How much did the shoe store lose in this transaction?

One table can seat six people, two tables can seat ten people and seven tables can seat several people.

How many tables can you put together for 38 people to sit down?

One night, three people went to a hotel and stayed in 300 yuan for one night. Three people just each paid 100 to make up 300 yuan for the boss. 3× 100=300 (yuan)

Later, the boss said that he would hold an activity today and give a discount to 250 yuan. He took out 50 yuan's money and told the waiter to return it to the three of them.

300-250=50 (yuan)

The waiter secretly hid 20 yuan and gave the remaining 30 yuan money to the three of them, each 10 yuan.

50-20=30 (yuan)

30÷3= 10 (yuan)

In this way, we just paid 100 yuan, and now we have paid back 10 yuan, which is 90 yuan.

100- 10=90 (yuan)

Everyone only spent 90 yuan's money, and 90 yuan was 270 yuan for three people each.

3×90=270 (yuan)

20 yuan, who was hidden by the waiter, was 290 yuan.

270+20=290 (yuan)

1where did 0 yuan go?

300-290= 10 (yuan)

Who can tell me where 10 yuan is?

5. Xiao Qiang 10 years old, Xiaoming 13 years old. How old are they when the sum of their ages is 39?

6. A businessman, 70 yuan, bought a dress and sold it at a higher price 12 yuan. Later, it was discovered that the 100 yuan paid by the buyer was counterfeit, which greatly distressed the businessman. Now, please help the unfortunate businessman figure out how much money he lost on this dress.

7, 5 boxes of jelly with the same weight, if each box takes out 12 kg, then the weight of the remaining 5 boxes of jelly is equal to the weight of the original two boxes of jelly. How many kilograms of jelly are there in each box?

8. March 1 2004 is Wednesday. March 2005 1 What day is it?

9. The distance between Party A and Party B is 636 kilometers. Car A leaves from Party A at 9 am and arrives at Party B at 3 pm. How many kilometers does this car average per hour?

10, the difference between the number in ten digits and the number in two digits is 3, and the sum is three times the difference. Find these two numbers.