Question

В в комплекте учебных пособий по математике входят учебник и две рабочие тетради. На класс купили 28 комплектов , заплатив 3360 р. По какой цене купили учебники, если каждая рабочая тетрадь стоит 20 р.? Помогите очень надо!

Answer 1

3360/28=120 р стоит 1 комплект
120-2*20=120-40=80р стоит учебник

Answer 2

Calculation of the Price of Textbooks

To calculate the price of the textbooks, we need to determine the cost of each textbook and then multiply it by the number of textbooks in a set.

Given that each set includes one textbook and two workbooks, and each workbook costs 20 rubles, we can calculate the cost of the workbooks in a set.

Let's denote the cost of each textbook as x rubles.

The cost of the workbooks in a set is 2 workbooks * 20 rubles/workbook = 40 rubles.

The total cost of each set, including the textbook and workbooks, is the sum of the cost of the textbook and the cost of the workbooks: x + 40 rubles.

We are also given that 28 sets were purchased for a total cost of 3360 rubles.

To find the cost of each textbook, we can set up the following equation:

28 sets * (cost of textbook + cost of workbooks) = 3360 rubles

28 * (x + 40) = 3360

Solving this equation will give us the cost of each textbook.