Question

На нижней полке на 12 книг больше, чем на верхней. После того, как с нижней полки переставили на верхнюю одну книгу, на верхней полке оказалось в 1,5 раза меньше книг, чем на нижней. Сколько книг было на верхней полке?? Пожалуйста!)

Answer 1

Надо думать своей головой,а не слушать других

Answer 2

Problem Analysis

We are given the information that there are 12 more books on the bottom shelf than on the top shelf. After moving one book from the bottom shelf to the top shelf, the number of books on the top shelf is 1.5 times less than the number of books on the bottom shelf. We need to determine the number of books on the top shelf.

Solution

Let's assume the number of books on the top shelf is x. According to the given information, the number of books on the bottom shelf is x + 12.

After moving one book from the bottom shelf to the top shelf, the number of books on the top shelf becomes x + 1, and the number of books on the bottom shelf becomes x + 12 - 1 = x + 11.

We are also given that the number of books on the top shelf is 1.5 times less than the number of books on the bottom shelf. Mathematically, this can be expressed as:

x + 1 = (1 - 1.5) * (x + 11)

Simplifying the equation:

x + 1 = -0.5 * (x + 11)

x + 1 = -0.5x - 5.5

1 + 5.5 = -0.5x - x

6.5 = -1.5x

Dividing both sides by -1.5:

x = -6.5 / -1.5

x = 4.33

Since the number of books cannot be a fraction, we can round down to the nearest whole number. Therefore, the number of books on the top shelf is 4.

Answer

There were 4 books on the top shelf.