Question

В коробке было красных карандашей в 2 раза больше,чем синих.Когда в коробку положили еще 6 синих карандашей2,то их стало столько же,сколько и красных.Сколько синих карандашей стало в коробке? Я понимаю,нужно решение...

Answer 1

6*2=12(синих) карандашей стало в коробке
Ответ: 12 

Answer 2

Пусть синих карандашей будет х, тогда красных 2х, 
Составим уравнение:
2х=х+6
2х-х=6
х=6-было синих карандашей.
6+6=12 Стало синих карандашей
Ответ: 12 синих карандашей стало в коробке

Answer 3

Problem Analysis

We are given that there are twice as many red pencils as blue pencils in a box. When 6 blue pencils are added to the box, the number of blue pencils becomes equal to the number of red pencils. We need to find the number of blue pencils in the box.

Solution

Let's assume the initial number of blue pencils in the box is x. According to the given information, the number of red pencils in the box is twice the number of blue pencils, so the initial number of red pencils is 2x.

When 6 blue pencils are added to the box, the number of blue pencils becomes x + 6. At the same time, the number of red pencils remains the same, which is 2x.

According to the problem, the number of blue pencils becomes equal to the number of red pencils after adding 6 blue pencils. So we can set up the following equation:

x + 6 = 2x

Now, let's solve this equation to find the value of x.

x + 6 = 2x

Subtract x from both sides:

6 = x

Therefore, the initial number of blue pencils in the box is 6.

Answer

The number of blue pencils in the box is 6.