Question

За блокнот и книгу заплатили 120 руб. Книга дороже блокнота в 5 раз. Сколько стоит каждая из покупок?

Answer 1

Пусть блокнот - х, тогда 5х-книга.
по условию задачи составим и решим уравнение
х+5х=120
6х=120
х=120/6
х=20

Если х=20, то 5х=100(руб)
Ответ: 20 рублей стоит блокнот, 100 рублей стоит книга

Answer 2

5х+х=120
6х=120
Х=20

20- стоимость блокнота
20*5=100 стоит книга

Answer 3

Problem Analysis

We are given that the total cost of a notebook and a book is 120 rubles. The book is 5 times more expensive than the notebook. We need to find the cost of each purchase.

Solution

Let's assume the cost of the notebook is x rubles. According to the given information, the cost of the book is 5 times the cost of the notebook, which means the cost of the book is 5x rubles.

The total cost of the notebook and the book is 120 rubles. Therefore, we can write the equation:

x + 5x = 120

Simplifying the equation:

6x = 120

Dividing both sides of the equation by 6:

x = 20

So, the cost of the notebook is 20 rubles, and the cost of the book is 5 times that, which is 100 rubles.

Answer

The notebook costs 20 rubles, and the book costs 100 rubles.