Question

48 книг расставили по 3 полкам, причём на 1 полке оказалось на 3 книги меньше, чем на второй, а на 3 на 6 больше, чем на второй. Сколько книг стоит на первой полке? (не уравнением, пожалуйста.)(с пояснением) Переспрашиваю, ведь на прошлый такой же вопрос никто не ответил! (Мирби, кто-нибудь из вас знает Мирби?)

Answer 1

1) 48+3-6=45 (книг) на трёх полках в равенстве с учетом условий задачи
2) 45:3=15 (книг) на второй полке
3) 15+6=21 (книг) на третьей полке
4) 15-3=12 (книг) на первой полке
Проверка 12+15+21=48 (книг) на трёх полках
Ответ: 12 книг.

Answer 2

Problem Analysis

We are given that there are 48 books distributed among 3 shelves. The number of books on the first shelf is 3 less than the number of books on the second shelf, and the number of books on the third shelf is 6 more than the number of books on the second shelf. We need to determine the number of books on the first shelf.

Solution

Let's assume the number of books on the second shelf is x.

According to the given information: - The number of books on the first shelf is 3 less than the number of books on the second shelf, so it is x - 3. - The number of books on the third shelf is 6 more than the number of books on the second shelf, so it is x + 6.

The total number of books is the sum of the books on each shelf, which is equal to 48: (x - 3) + x + (x + 6) = 48

Simplifying the equation: 3x + 3 = 48

Subtracting 3 from both sides: 3x = 45

Dividing both sides by 3: x = 15

Therefore, there are 15 books on the second shelf.

To find the number of books on the first shelf, we substitute the value of x into the equation: x - 3 = 15 - 3 = 12

So, there are 12 books on the first shelf.

Answer

There are 12 books on the first shelf.