Question

За книгу заплатили 120 рублей. И ещё 1/3 стоимости книги. Сколько стоит книга?

Answer 1

Х ( руб ) стоимость книги
120 + ( 1/3)Х = Х
2/3х = 120
Х = 120 : 2/3
Х = 180 ( руб )
Ответ 180 рублей

Answer 2

Calculation of the Book's Cost

To calculate the cost of the book, we need to add the initial payment of 120 rubles to one-third of the book's cost.

Let's assume the cost of the book is represented by the variable x.

The equation can be written as:

120 + (1/3)x = x

To solve for x, we can multiply both sides of the equation by 3 to eliminate the fraction:

360 + x = 3x

Next, we subtract x from both sides of the equation:

360 = 2x

Finally, we divide both sides of the equation by 2 to solve for x:

x = 360 / 2 = 180

Therefore, the cost of the book is 180 rubles.