Question

СРОЧНО На трёх полках находятся 100 книг. На первой полке в два раза больше книг, чем на второй, а на третьей — на 15 книг меньше, чем на первой. Сколько книг на каждой полке? На первой полке книг — . На второй полке книг — . На третьей полке книг — .

Answer 1

Ответ:

На первой полке 46 книг

На второй полке 23 книги

На третьей полке 31 книга

Объяснение:

Так как х равен 23 трём мы делаем действия соответствующие каждой полке, например...

Первая полка. 2х=2*23=46 и т. д.

Answer 2

Problem Analysis

We are given three shelves with a total of 100 books. The number of books on the first shelf is twice the number on the second shelf, and the number of books on the third shelf is 15 less than the number on the first shelf. We need to determine the number of books on each shelf.

Solution

Let's assume the number of books on the second shelf is x.

According to the problem, the number of books on the first shelf is twice the number on the second shelf, so it would be 2x.

The number of books on the third shelf is 15 less than the number on the first shelf, so it would be 2x - 15.

We know that the total number of books on all three shelves is 100. Therefore, we can write the equation:

x + 2x + (2x - 15) = 100

Simplifying the equation:

5x - 15 = 100

Adding 15 to both sides:

5x = 115

Dividing both sides by 5:

x = 23

So, there are 23 books on the second shelf, 46 books on the first shelf, and 31 books on the third shelf.

Answer

There are 46 books on the first shelf, 23 books on the second shelf, and 31 books on the third shelf.