Question

Реши задачу. Запиши краткую запись. Вычисли и запиши ответ. Книга дороже тетради на 80 руб. за книгу и тетрадь заплатили 120 руб. Сколько нужно заплатить за 5 таких тетрадей и 3 такие книги?

Answer 1

(120-(120-80):2)*3+(120-(120-80):2)*5=400

Answer 2

1) 120-80 = 40 (р) - стоимость тетради
2) 120 * 3 = 360 (р) - заплатили за 3 книги
3) 40 * 5 = 200 (р) - заплатили за 5 тетрадей
4) 360 + 200 = 560 (р) - заплатили за все вместе

Answer 3

Task Solution

To solve the given problem, we'll first calculate the cost of one book and one notebook. Then, we'll use these values to find the total cost for 5 notebooks and 3 books.

Given: - The book is 80 rubles more expensive than the notebook. - The total cost for one book and one notebook is 120 rubles.

Let's calculate the cost of one book and one notebook:

Step 1: Let's assume the cost of the notebook is x rubles. Step 2: The cost of the book would then be (x + 80) rubles. Step 3: According to the given information, the total cost for one book and one notebook is 120 rubles. So, we have the equation: x + (x + 80) = 120.

Now, let's solve for x: ``` 2x + 80 = 120 2x = 120 - 80 2x = 40 x = 40 / 2 x = 20 ``` So, the cost of one notebook is 20 rubles, and the cost of one book is 100 rubles.

Now, let's calculate the total cost for 5 notebooks and 3 books:

Step 1: Total cost for 5 notebooks = 5 * 20 = 100 rubles. Step 2: Total cost for 3 books = 3 * 100 = 300 rubles. Step 3: Total cost for 5 notebooks and 3 books = 100 + 300 = 400 rubles.

Therefore, the total cost for 5 notebooks and 3 books is 400 rubles.

Answer

The total cost for 5 notebooks and 3 books is 400 rubles.