Question

Маша купила учебник ,тетрадь и ручку заплатив за всю покупку 385 руб. учебник стоил в 6 раз больше, чем ручка ,а тетрадь- на 15 руб. меньше ,чем ручка. сколько рублей стоила ручка?

Answer 1

X руб. - ручка
6х руб. - ученик
(х-15) руб. - тетрадь
Всего: 385 руб.
6+6х+х-15=385
8х=400
х=50
Ручка стоила 50 рублей.

Answer 2

Calculation of the Cost of the Pen

To determine the cost of the pen, let's assign variables to the prices of the textbook, notebook, and pen.

Let: - x be the price of the pen in rubles, - 6x be the price of the textbook (since it is 6 times more expensive than the pen), - x - 15 be the price of the notebook (since it is 15 rubles less than the pen).

According to the given information, the total cost of the purchase is 385 rubles. We can set up the following equation:

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

Simplifying the equation, we get:

8x - 15 = 385

Now, let's solve for x:

8x = 400

x = 50

Therefore, the pen costs 50 rubles.