Question

5. На трьох полицях 130 книжок, причому на другій полиці на 15 книжок більше, ніж на першій, а на третій- на 12 книжок менше, ніж на першій. Скільки книжок стоїть на кожнійполиці?​

Answer 1

Ответ:

Пошаговое объяснение:

x - количество книг на 1-й полке.

x+(x+15)+(x-12)=130

3x+3=130

x=127/3=42,(3) - ответ не подходит по смыслу.

Задача составлена неверно.

Answer 2

Problem Analysis

We are given three shelves with a total of 130 books. The second shelf has 15 more books than the first shelf, and the third shelf has 12 fewer books than the first shelf. We need to determine the number of books on each shelf.

Solution

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

According to the given information: - The second shelf has 15 more books than the first shelf, so the number of books on the second shelf is x + 15. - The third shelf has 12 fewer books than the first shelf, so the number of books on the third shelf is x - 12.

The total number of books on all three shelves is 130, so we can write the equation: x + (x + 15) + (x - 12) = 130.

Simplifying the equation: 3x + 3 = 130.

Solving for x: 3x = 130 - 3, 3x = 127, x = 127 / 3.

Calculating the value of x: x ≈ 42.33.

Since the number of books must be a whole number, we can round x to the nearest whole number: x ≈ 42.

Therefore, there are approximately 42 books on the first shelf, 42 + 15 = 57 books on the second shelf, and 42 - 12 = 30 books on the third shelf.

Answer

There are approximately 42 books on the first shelf, 57 books on the second shelf, and 30 books on the third shelf.