Question

В коробке было несколько кубиков после того как брат взял из коробки 3 кубика А сестра положила в коробку 5 кубиков в коробке стало 12 кубиков сколько кубиков было в коробке сначала Запиши решение задачи по действиям с пояснениями

Answer 1

12-5=7(кубиков)-было до того пока сестра положила кубики

7+3=10(кубиков)-было изначально

Ответ:10 кубиков 

Answer 2

1) 12-5=7(к.)-было, пока не положила 5 кубиков сестра
2) 7+3=10(к.) - было первоначально.
Ответ: 10 кубиков было в коробке.

Answer 3

Problem Analysis

We are given the following information: - There were initially some cubes in a box. - The brother took out 3 cubes from the box. - The sister put 5 cubes into the box. - After these actions, there were 12 cubes in the box.

We need to determine the number of cubes that were initially in the box.

Solution

Let's assume that the initial number of cubes in the box is x.

According to the given information, the following equations can be formed: - After the brother took out 3 cubes, the number of cubes in the box decreased by 3: x - 3. - After the sister put 5 cubes into the box, the number of cubes in the box increased by 5: (x - 3) + 5. - After these actions, there were 12 cubes in the box: (x - 3) + 5 = 12.

To find the value of x, we can solve this equation:

(x - 3) + 5 = 12

Simplifying the equation:

x - 3 + 5 = 12

x + 2 = 12

Subtracting 2 from both sides:

x = 10

Therefore, the initial number of cubes in the box was 10.

Answer

There were initially 10 cubes in the box.

Explanation

Initially, there were x cubes in the box. After the brother took out 3 cubes, the number of cubes in the box decreased to (x - 3). Then, the sister put 5 cubes into the box, increasing the number of cubes to (x - 3) + 5. Finally, we are given that there were 12 cubes in the box, so we can set up the equation (x - 3) + 5 = 12. Solving this equation, we find that the initial number of cubes in the box was 10.