Question

Помогите решить задачу. В стопку книг положили ещё 10 книг. После этого в ней стало в три раза больше книг чем было. Сколько книг было в стопке первоначально? Если можно без уравнения.

Answer 1

Ответ:

первоначально в стопке было 5 книг

Пошаговое объяснение:

Решила уравнением,больше никак

x+10=3x

3x-x=10

2x=10

x=10:2

x=5

Answer 2

Ответ:

х-первоначальное количество книг

х+10=3х

3х-х=10

2х=10

х= 10:2

х=5

Answer 3

Problem Analysis

To solve this problem, we need to determine the initial number of books in the stack. We are given that after adding 10 more books, the number of books in the stack became three times the original number. We can solve this problem without using an equation by using logical reasoning.

Solution

Let's assume that the initial number of books in the stack is x. After adding 10 more books, the total number of books in the stack becomes 3x.

According to the problem, the number of books in the stack increased by 10, which means that the difference between the final number of books and the initial number of books is 10.

Therefore, we can write the equation:

3x - x = 10

Simplifying the equation, we get:

2x = 10

Dividing both sides of the equation by 2, we find:

x = 5

So, the initial number of books in the stack was 5.

Answer

The initial number of books in the stack was 5.