Question

Мама купила учебник, тетрадь и ручку заплатила за всю покупку 385 руб. Учебник стоил в 6 раз больше чем ручка, а тетрадь на 15 р. меньше чем ручка. сколько рублей стоит каждый предмет?

Answer 1

Пусть ручка стоила = х (руб),
тогда учебник стоил = 6х (руб),
а тетрадь стоила = (х - 15) руб.
По условию задачи составим уравнение:
х + 6х + х - 15 = 385
8х = 385 + 15
8х = 400
х = 50
6х = 50*6 = 300
х - 15 = 50 - 15 = 35
Ответ: 50 рублей стоила ручка; 300 рублей стоила книга;
            35 рублей - тетрадь.

Answer 2

Problem Analysis

We are given that a mother bought a textbook, a notebook, and a pen for a total of 385 rubles. The textbook costs 6 times more than the pen, and the notebook costs 15 rubles less than the pen. We need to determine the cost of each item.

Solution

Let's assume the cost of the pen is x rubles.

According to the given information: - The textbook costs 6 times more than the pen, so its cost is 6x rubles. - The notebook costs 15 rubles less than the pen, so its cost is x - 15 rubles.

The total cost of all three items is 385 rubles, so we can write the equation:

x + 6x + (x - 15) = 385

Simplifying the equation:

8x - 15 = 385

Adding 15 to both sides:

8x = 400

Dividing both sides by 8:

x = 50

Therefore, the pen costs 50 rubles.

Now we can calculate the cost of the textbook and the notebook:

- The textbook costs 6 times more than the pen, so its cost is 6 * 50 = 300 rubles. - The notebook costs 15 rubles less than the pen, so its cost is 50 - 15 = 35 rubles.

Answer

Based on the given information, the cost of each item is as follows: - The pen costs 50 rubles. - The textbook costs 300 rubles. - The notebook costs 35 rubles.