Question

На одной полке 38 книг(и), а на другой - 34. Со второй полки сняли несколько книг, а с первой - столько, сколько осталось на второй. После этого на первой полке осталось 13 книг. Сколько книг сняли со второй полки?

Answer 1

38-13=25
34-25=9
ответ:9 книг осталось

Answer 2

Problem Analysis

We have two shelves, one with 38 books and the other with 34 books. Some books were removed from the second shelf, and the same number of books were removed from the first shelf, leaving 13 books on the first shelf. We need to determine how many books were removed from the second shelf.

Solution

Let's assume that x books were removed from both shelves. After removing x books from the second shelf, the number of books remaining on the second shelf would be 34 - x. Since the same number of books were removed from the first shelf, the number of books remaining on the first shelf would be 38 - x.

According to the problem, the number of books remaining on the first shelf is 13. Therefore, we can set up the following equation:

38 - x = 13

Solving this equation will give us the value of x, which represents the number of books removed from both shelves.

Calculation

Let's solve the equation:

38 - x = 13

Subtracting 38 from both sides:

38 - 38 - x = 13 - 38

Simplifying:

-x = -25

Multiplying both sides by -1 to isolate x:

(-1)(-x) = (-1)(-25)

x = 25

Answer

Therefore, 25 books were removed from the second shelf.