Simple coffee problem to remember math teacher with gratitude

Many humanities believe that they do not need knowledge of mathematics. Why would a future linguist understand all these formulas and theorems? Just keep your head clogged. In fact, it is not good for anything, even if puzzle It can confuse an adult and educated person. Therefore, at least a little friend with mathematics is necessary for everyone.

And today's edition. "Site" It will offer some easy tasks that can be difficult for many adults. But such training is necessary for the mind. After all, if you believe the researchers, then mathematics classes develop logical thinking and memory, help in solving everyday problems and even lay the foundation for a successful career in any field.



Simple problem.

1. A cup of coffee with a sugar cube costs $3.10. Coffee is $3 more expensive than a sugar cube. How much does coffee cost and how much does a sugar cube cost? Many people think that the solution is obvious, but this is the main trick. Think carefully before calling the final answer.
   
   Of course, one task will not be enough for a full training. Therefore, we offer 2 more tasks that will certainly be interesting for both a child and a fully adult person.
   
   
   
   
   
   
2. Five diggers in 5 hours are able to dig 5 m of ditch. How many diggers will it take to dig 100 m of ditch in 100 hours? The answer here may seem obvious. However, if you think carefully about the conditions of the problem, you will have to admit that the diggers need not so much as originally expected.
   
   
3. When his father turned 31, his son turned 8 years old. Now the child younger than the father is exactly 2 times. How old is my father now and how old is my son? This kind of problem comes up a lot. Therefore, knowing a simple algorithm for their solution will not be superfluous. Can you give the right answer in a few minutes?
   
   
   
   
   
   

Solving simple problems

1. Many people think that coffee costs $3 and a sugar cube costs 10 cents. However, in this case, one of the conditions of the problem will be violated, where coffee is more expensive than a sugar cube by exactly $ 3, because the difference will be only $ 2 and 90 cents. The correct answer is that coffee costs $3 and 5 cents, and a sugar cube costs only 5 cents. Why do so many smart people make a mistake here? It's all about the banal rush.
   
   
   
   
   
   
2. It may seem that you need 100 mole rats at once, but such a conclusion will be hasty. And immediately invite so many diggers to perform the specified amount of work is not worth it. That's because these same 5 mole rats in 100 hours will dig the 100 meters of ditch that we need for the conditions of the task. Of course, the solution is purely mathematical, because in real life, any digger needs rest and he will not be able to work for 100 hours in a row.
   
   
3. First, you should find out how old the father is 31 – 8 = 23 years old. In this case, the child will be exactly 2 times younger than the father only when he is 23 years old. The father will be 23 * 2 = 46 years old.
   
   
   
   

We hope that you managed not only to solve all the problems, but also to train yours well. mathematical ability. And this is much more useful for a modern person than the daily thoughtless consumption of information from the Internet.