Question

ДАЮ 99Б! Ученик купил по одинаковой цене тетради в клетку и линейку тетрадей в линейку он купил на 4 больше чем в клетку и поэтому заплатил за них на 12 руб. больше Какова цена тетради? Нужно решение и КРАТКАЯ ЗАПИСЬ В В1 КОЛ-ВО ВСЕГО!

Answer 1

Ответ: 12:4=3 цена тетради

Answer 2

12:4=3 рубля
Ответ: за одну тетрадь заплатили 3 рубля

Answer 3

Problem Analysis

The student bought notebooks at the same price, one with grid lines and one with ruled lines. The number of notebooks with ruled lines is 4 more than the number of notebooks with grid lines, and the total cost of the notebooks with ruled lines is 12 rubles more than the total cost of the notebooks with grid lines. We need to find the price of a notebook.

Solution

Let's assume the price of a notebook with grid lines is x rubles. Since the student bought notebooks at the same price, the price of a notebook with ruled lines is also x rubles.

The number of notebooks with ruled lines is 4 more than the number of notebooks with grid lines. Let's denote the number of notebooks with grid lines as n. Therefore, the number of notebooks with ruled lines is n + 4.

The total cost of the notebooks with ruled lines is 12 rubles more than the total cost of the notebooks with grid lines. We can set up the following equation:

x(n + 4) = xn + 12

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

x(n + 4) = xn + 12

Expanding the equation:

xn + 4x = xn + 12

Subtracting xn from both sides:

4x = 12

Dividing both sides by 4:

x = 3

Therefore, the price of a notebook is 3 rubles.

To find the total number of notebooks, we can substitute the value of x into the equation:

n + 4 = 3 + 4 = 7

Therefore, the student bought a total of 7 notebooks.

Answer

The price of a notebook is 3 rubles. The student bought a total of 7 notebooks.