Question

Помогите решить задачу Андрей купил 3 тетради 5 центов у него осталось На 4 тетради у него не хватает 5 центов Сколько всего у него было денег и сколько стоит одна тетрадь？

Answer 1

Уравнение, где Х - стоимость тетради

3х+5=4Х-5

4Х-3Х=5+5

Х=10 центов - стоимость тетради

10·3+5=35 центов было в наличии

Без уравнения:

5+5=10 центов (остаток и недостача) -стоимость тетради

10+10+10+5=35 центов было изначально

Answer 2

Problem Analysis

To solve this problem, we need to determine the total amount of money Andrey had and the cost of one notebook. We are given that Andrey bought 3 notebooks for 5 cents each and had 5 cents left after buying them. We also know that he was 5 cents short when buying 4 notebooks.

Solution

Let's assume the cost of one notebook is x cents. We can set up the following equation based on the given information:

3x + 5 = 4x

Simplifying the equation, we get:

x = 5

Therefore, the cost of one notebook is 5 cents.

To find the total amount of money Andrey had, we can substitute the value of x into the equation:

3 * 5 + 5 = 20

Therefore, Andrey had a total of 20 cents.

Answer

Andrey had a total of 20 cents and the cost of one notebook is 5 cents.