Question

Оставалось последние - песочница для малышей.Для неё Костя принёс три доски: одну длиной 55 дм ,другую в 5 раз короче первой, а третью - на 11 дм короче короче первой. Распилив только самую длинную доску на 2 части ребята сделали песочницу длинной 44 дм. вычисли доску какой длины нужно отпилить от самой длинной доски чтобы удалось сделать песочницу и определи её периметр.

Answer 1

55:5=11 11 умножить на 11=121 

Answer 2

1) 55 : 5 = 11(дм) - длина второй доски
2) 55 - 11 = 44(дм) - длина третьей доски
3) 55 - 11 = 44(дм) отпилили от самой длинной доски
4) Теперь получилось: две доски по 44дм - это длина песочницы
                          и две доски = по 11дм - это ширина песочницы
   2 (44 + 11) = 2 * 55 = 110(дм) - периметр
Ответ: 110дм - периметр песочницы.

Answer 3

Problem Analysis

Kostya brought three boards for the sandbox: one is 55 dm long, the second is 5 times shorter than the first, and the third is 11 dm shorter than the first. The longest board was cut into two parts, resulting in a sandbox that is 44 dm long. We need to determine the length of the board that needs to be cut from the longest board to make the sandbox and calculate its perimeter.

Solution

Let's calculate the length of the second board and the third board using the given information.

The second board is 5 times shorter than the first board, so its length can be calculated as: Length of the second board = Length of the first board / 5

The third board is 11 dm shorter than the first board, so its length can be calculated as: Length of the third board = Length of the first board - 11 dm

Now, let's calculate the length of the board that needs to be cut from the longest board to make the sandbox. We know that the sandbox is 44 dm long, and it was made by cutting the longest board into two parts. So, the length of the board that needs to be cut can be calculated as: Length of the board to be cut = Length of the longest board - Length of the sandbox

Finally, let's calculate the perimeter of the sandbox. The perimeter of a rectangle can be calculated by adding the lengths of all four sides. Since the sandbox is rectangular, its perimeter can be calculated as: Perimeter of the sandbox = 2 * (Length + Width)

Let's calculate the values step by step.

Calculation

Given: - Length of the first board = 55 dm - Length of the sandbox = 44 dm

1. Calculate the length of the second board: Length of the second board = Length of the first board / 5 Length of the second board = 55 dm / 5 = 11 dm

2. Calculate the length of the third board: Length of the third board = Length of the first board - 11 dm Length of the third board = 55 dm - 11 dm = 44 dm

3. Calculate the length of the board to be cut: Length of the board to be cut = Length of the longest board - Length of the sandbox Length of the board to be cut = 55 dm - 44 dm = 11 dm

4. Calculate the perimeter of the sandbox: Perimeter of the sandbox = 2 * (Length + Width) Since the sandbox is rectangular and we only have the length, we assume the width is equal to the length. Perimeter of the sandbox = 2 * (44 dm + 44 dm) = 2 * 88 dm = 176 dm

Answer

To make the sandbox, Kostya needs to cut a board that is 11 dm long from the longest board. The perimeter of the sandbox will be 176 dm.