100 college students answered 99 elementary school arithmetic questions incorrectly, come and see

18+79=97 (RMB).

What was lost was the cost of a gift and the 79 yuan found for the young man, a total of 97 yuan.

Don't think about unnecessary things.

Boss Wang collected 100 yuan of fake money, exchanged 100 yuan for change with the neighbors, and found 79 yuan from these changes for the young lady, that is, the 79 yuan was found from the 100 yuan exchanged for the neighborhood. The boss has not lost so far, and later the neighbors found out that the money was fake and asked the boss to pay back 100 yuan. And there is still 21 yuan left in the change, that is, the boss lost the 79 yuan and a gift for the young lady.

Although the cost price of the gift is 18 yuan, it is still worth 21 yuan if it is sold, so the boss loses 100 yuan.

Correct solution. The owner exchanged 100 fake money for 100 real money for the neighbor. - The boss didn't pay 1 penny - and got 100 yuan. Later, I returned 100 to my neighbor. Figure it out here - this question is ok.

For example, I have two $10 tickets. One is a counterfeit banknote. I'll take out a fake $10 bill and exchange it for a genuine $10 bill with you.

Then take $10 to buy something. You find out that the $10 is a counterfeit - and you run back to me to get your $10 back. So I don't have any money.

Generally. It's me who buys things with real money.

In fact, the boss paid 79 yuan for others - the ** of the commodity is either 18-or 21. So the boss loses 97 or 100 yuan.

The money exchange side is the key to this question.

He gave 100+ to the neighborhood, 79 + to the young people, and the cost was 18 = 197 yuan.

197 yuan 18 yuan cost;

$79 was given to young people;

100 yuan was given to the neighborhood;

The total is 197 yuan, which is Boss Wang's loss!

To put it simply, the boss changed 100 from the neighbor, and then returned 100, and the other was eliminated;

The purchase price of clothes is 18, and the loss is 18;

79 to the guy, 79 to the loss;

So the total loss: 18 + 79 = 97

79+18=97 Regardless of the rest, the boss has so much to think about.

If you add the profit. The boss lost a hundred dollars.

100 (money for the neighborhood) + 79 (money for the guy) + 18 (purchase price of clothes) + 3 (profit for clothes) = 200

It can be understood in this way, based on Boss Wang's entry and exit, assuming that the money is real, how much money Boss Wang makes, it is obviously 5 yuan (after the young man leaves), but the money is fake, as a result, Boss Wang wants to take out 100 to the neighbor, that is, 5-100 = --95 yuan.

Tips: It's a little easy to misunderstand, the boss of Wang Socks Hail gave 20 yuan of items, in fact, at the same time as giving, he used the fake 100 yuan of Changfan to exchange 100 yuan for 100 yuan of change and took 75 yuan to the young man, but there are still 25 yuan in hand, so Xun Mao said that he earned 5 yuan (this is not found when he did earn 5 yuan).

Solution: He sold a total of 4 people to burn cakes, and he sold a total of the number of baked cakes:

1 + 2 + 4 + 8 = 15 pcs.

It can be understood in this way, based on Boss Wang's entry and exit, assuming that the money is real, how much money Boss Wang made is 5 yuan (after the young man left to tell Changfan), but the money is fake, as a result, Boss Wang wants to take out 100 to his neighbors, that is, 5-100 = --95 yuan.

Tips: It's a little easy to misunderstand, Boss Wang gave 20 yuan of items, in fact, at the same time as Xun Ant, he used the fake 100 yuan for 100 yuan of change and took 75 yuan to the young man, but there are still 25 yuan in hand, so he earned 5 yuan (this is indeed 5 yuan when he didn't find out).

79 + 18 = 97 (yuan).

Simplifying this issue:

Everyone understands that the neighbors have not lost a penny.

The young man got 79 yuan and a merchandise worth 18 yuan for nothing.

Then in this transaction, Boss Wang's loss is the young man's gain for nothing.

That is: Boss Wang lost 79 + 18 = 97 yuan.

If the gift is calculated at the cost of 18 yuan plus 3 yuan for a total of 21 yuan, it is a loss of 100 yuan.

Lost $97.

Why do you come up with this kind of question?

I've had several encounters...

Recall the answer last time, it should be 140 The boss of the mountain type out of the capital is a total of 65 + 100 = 165 to the hawker began to exchange 100 fake money back to 100 real money to tease the silver guess, and then returned it to the hawker, but he found 75 yuan to the customer and left 25 yuan to fight the real money, so the loss should be 165-25 = 140

The 100 to the vendor next door in exchange for 100 change, so there is no loss in this step When the 200 is real money, the shopkeeper earns 60 yuan According to Hu Haoyu's original sock pin is 0 yuan, now the pants rock is +60 Now 200 is a counterfeit banknote, which can be regarded as a loss of 200 That is 60-200 = negative 140 So it is a loss of 140 yuan.