Question

Саша в магазине приобрел книгу за 120 рублей, что составило 3/5 имевшихся у него денег. Затем он купил фотоальбом и у него осталось 18 рублей. Сколько стоил фотоальбом?

Answer 1

1) 120 : 3/5 = 20 * 5/3 = 200 рублей было у Саши всего
2) 200 - 120 - 18 = 62 рубля стоил фотоальбом

Answer 2

Problem Analysis

We are given that Sasha purchased a book for 120 rubles, which was 3/5 of the money he had. After buying the book, he had 18 rubles left. We need to determine the cost of the photo album.

Solution

Let's assume that Sasha initially had x rubles. According to the given information, he spent 3/5 of his money on the book, which is equal to 120 rubles. We can set up the following equation to represent this:

(3/5) * x = 120

To find the value of x, we can multiply both sides of the equation by (5/3):

x = (120 * 5) / 3

Simplifying this expression, we find that x = 200. Therefore, Sasha initially had 200 rubles.

After buying the book, Sasha had 18 rubles left. Let's assume the cost of the photo album is y rubles. We can set up the following equation to represent this:

x - 120 - y = 18

Substituting the value of x as 200, we can solve for y:

200 - 120 - y = 18 80 - y = 18 -y = 18 - 80 -y = -62 y = 62

Therefore, the cost of the photo album is 62 rubles.

Answer

The photo album cost 62 rubles.