Question

Реши задачу Вычисли и запиши ответ книга дороже тетради на 80 руб. за книгу и тетрадь заплатили 120 руб. Сколько нужно заплатить за 5 тетрадей и 3 таких же книги. на пишите пж по действиям всего 6 действий

Answer 1

Пусть тетрадь- х, тогда книга- х+80.
х+х+80=120
2х=40
х=20(руб)-стоит тетрадь
20+80=100(руб)-стоит книга
5*20+3*100=100+300=400(руб)
Ответ:400 рублей

Answer 2

1)120-80=40(р) стоили бы книга и тетрадь при стоимости тетради. 2)40:2=20(р) стоит тетрадь 3)20+80=100(р) стоит книга. 4) 20*5=100(р) стоит 5 тетрадей 5)100*3=300(р) стоят 3 книги. 6)100+300=400(р). Ответ: 400 р будет стоить покупка

Answer 3

Problem Analysis

To solve this problem, we need to find the total cost of 5 notebooks and 3 notebooks, given that the book is 80 rubles more expensive than the notebook and the total cost of a book and a notebook is 120 rubles.

Solution

Let's break down the problem into steps:

Step 1: Let's assume the cost of a notebook is x rubles. Step 2: According to the problem, the cost of a book is 80 rubles more than the cost of a notebook. So, the cost of a book is x + 80 rubles. Step 3: The total cost of a book and a notebook is given as 120 rubles. So, we can write the equation: x + (x + 80) = 120. Step 4: Simplifying the equation, we get: 2x + 80 = 120. Step 5: Subtracting 80 from both sides of the equation, we get: 2x = 40. Step 6: Dividing both sides of the equation by 2, we get: x = 20.

Now that we have found the cost of a notebook, we can calculate the total cost of 5 notebooks and 3 books.

Step 7: The total cost of 5 notebooks is: 5 * x = 5 * 20 = 100 rubles. Step 8: The total cost of 3 books is: 3 * (x + 80) = 3 * (20 + 80) = 3 * 100 = 300 rubles.

Therefore, the total cost of 5 notebooks and 3 books is 100 rubles for the notebooks and 300 rubles for the books.

Answer

The total cost of 5 notebooks and 3 books is 100 rubles for the notebooks and 300 rubles for the books.