What should I do if I lose a dollar while staying in a hotel?

3 times 9 = 27 2 = 29 yuan. Is there one yuan left?

Three guests went to a hotel to stay. The accommodation fee was 30 yuan. The hotel discount only charged 25 yuan, so they wanted The waiter returned 5 yuan to the guest, while the server took 2 yuan and returned 3 yuan to the guest. That is to say, each person only paid 9 yuan. 3 times 9 yuan equals 27 yuan plus the 2 yuan taken by the waiter equals 29 yuan. Where did the other dollar go? One *** was paid 30 yuan. 3 yuan was returned. That’s 27 yuan. Among them, 2 yuan was taken away by the waiter. 25 yuan as hotel fee. ?

If you want to find the source of the total amount of 30 yuan. It should be calculated like this: Each person only paid 9 yuan, and 3 times 9 yuan equals 27 yuan. ?

The key point is here: ?

The 2 yuan that the waiter took away was taken after the customer paid. In other words, 27 of them far includes the 2 yuan. Plus the 3 yuan refunded to the guest is exactly 30 yuan. ?

This question is actually a brain teaser: ?

30 yuan = the amount of money actually paid by the guest that was refunded?

It should not = the amount actually paid by the guest The money you paid was taken away by the waiter. This is the wrong algorithm.

Introduction

As the name suggests: Brain broadly refers to thinking and ideas. A sharp turn refers to driving to another route when there are obstacles ahead that prevent the car from traveling in a straight line. A sharp turn is usually when there are special circumstances and it is necessary to quickly leave the usual route and take another route. Brainteasers mean that when your thinking encounters special obstacles, you must quickly leave your habitual thinking and think about the problem from other aspects. Generally refers to some intelligence questions that cannot be answered using usual ideas.

This kind of word game has an obvious feature. The questions are very ordinary, but the answers are very irritating or funny. Sometimes, they can indirectly curse people. Once cracked, it will make people angry. So brain teasers can also help to adjust the atmosphere at parties.

Eight benefits

1. Develop intelligence

2. Activate brain cells and exercise your brain

3. Improve imagination

4. Prevent Alzheimer's disease

5. Liven up the atmosphere (a good brainteaser can bring two people closer together)

6. Expand knowledge (many of them contain allusions)

7. Improve your sense of humor (can be added to informal speeches)

8. Break the inertia of thinking?[1]?(There may be different opinions)

Origin

Brain teasers originated in ancient India. Brain Teasers is a series of single comic jokes published by Times Culture on December 6, 1989. It ranges from comic-style questions on the previous page to unexpected answers after turning the page. It caused a huge popularity craze in Taiwanese society at that time. People in the streets and alleys were asking each other about brain teasers. It evolved into a pattern of bad jokes and was later introduced to mainland China.