Question

На двух полках вместе 120 книг Причем на первой полке книг в 3 раза больше чем второй Сколько книг на каждой полке в плацкартном вагоне в 3 раза больше спальных мест чем в мягком вагоне всего в этих вагонов 72 мест сколько спальных мест в мягком вагоне

Answer 1

1) х*3+х=120
4х=120
х=30

30*3=90
Ответ: на первой полке 90 книг, а на второй 30 книг.

2) х*3+х=72
4х=72
х=18

18*3=54 места в плацкардком вагоне
72-54=18
Ответ: в мягком вагоне 18 мест

Answer 2

Problem Statement

In a train, there are two shelves with a total of 120 books. The number of books on the first shelf is three times the number of books on the second shelf. In another train, there are three times as many sleeping berths in the economy class as there are in the soft class. The total number of berths in these two classes is 72. How many sleeping berths are there in the soft class?

Solution

Let's solve the problem step by step.

1. Let's assume the number of books on the second shelf is x. 2. According to the problem, the number of books on the first shelf is three times the number of books on the second shelf. So, the number of books on the first shelf is 3x. 3. The total number of books on both shelves is 120. Therefore, we can write the equation: x + 3x = 120. 4. Simplifying the equation, we get: 4x = 120. 5. Dividing both sides of the equation by 4, we find: x = 30. 6. So, there are 30 books on the second shelf and 90 books on the first shelf.

Now, let's move on to the second part of the problem.

1. Let's assume the number of sleeping berths in the soft class is y. 2. According to the problem, there are three times as many sleeping berths in the economy class as there are in the soft class. So, the number of sleeping berths in the economy class is 3y. 3. The total number of berths in both classes is 72. Therefore, we can write the equation: y + 3y = 72. 4. Simplifying the equation, we get: 4y = 72. 5. Dividing both sides of the equation by 4, we find: y = 18.

Therefore, there are 18 sleeping berths in the soft class.