The task that schoolchildren solve playfully, revelling in their wit, adults thoughtfully scratch the back of their head

Solving problems with the child This is a very useful activity, which is not a pity to waste time. After all, in this way you not only help your child to understand the educational material and invest in its education, but also refresh the memory of long-forgotten knowledge. But this warm-up for the mind is very useful at any age.

And today's edition. "Site" It offers to solve a couple of interesting problems that are easy to cope with exemplary students. But it is interesting that an adult who has already forgotten what wisdom he was taught in mathematics lessons is not always able to find the right solution. So why not test yourself?



When a child from the first grade of school is difficult to mathematics, parents usually immediately write down their child in the “humanities”, thus convincing themselves and the child that the exact sciences he can not teeth. But it's too simple and wrong.



After all, it is already from the first grade to solve problems with the child, to help and explain so that he learns the basic algorithms of the solution, which in the future will help him perform tasks from other fields of science. Let’s start with our tasks today.



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1. The first task does not seem to be difficult, and it is given to children already in junior grades. I wonder what it feels like for parents with diplomas and years of experience in serious positions who can’t help their child with such homework? According to the conditions of the problem, it is known that 18 kg of jam was evenly spread out in six jars. And you need to find out how many cans are required in order to evenly spread 24 kg of jam. Can you find a solution without a calculator in 1 minute?
   
   
   
   
   
   
2. The second problem may seem more complicated, but with it experienced mathematician will not have problems. And this task can be solved in several ways. You can find it. motorboat speedusing the following conditions? And we know that the motor boat behind the current moves at a speed of 48 km / h, and against the current - at a speed of 42 km / h. Is it possible to find not only the speed of the boat, but also the speed of the current? How many times does the boat travel faster than the current?
   
   
   
   
   
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Tips and answers

1. If 18 kg of jam requires 6 jars, then 18 / 6 = 3 kg of jam should be placed in one jar. And if so, then for 24 kg of jam we need 24/3 = 8 jars. As you can see, the answer was really easy to find.
2. If we have the speed of the boat behind the current and against the current, then the arithmetic mean here will be equal to the speed of the boat itself. Therefore (48 + 42) / 2 = 90 / 2 = 45 km / h. In this case, the speed of the river is 48 – 45 = 3 km / h. And then 45/3 = 15. This means that the speed of the boat exceeds the speed of the river by 15 times.
   
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Don’t forget to share in the comments how you solved these school problems and whether your answers matched ours. And also solve other fascinating problems to always keep your brain in good shape.