Question

Школьная библиотека получила 3420 новых учебников, что составило одну десятое часть всех уже имевшихся в библиотеке учебников.Сколько учебников стало в школьной библиотеке?

Answer 1

х = 100%                          

3420 = 10%

 

х = 3420*100/10=34200 - имелось учебников

 

34200+3420=37620 - стало учебников

 

Ответ: 37620 стало учебников в школьной библиотеке

Answer 2

Calculation of the Number of Textbooks in the School Library

To determine the number of textbooks in the school library after receiving 3420 new textbooks, we need to find the total number of textbooks that were already in the library.

According to the given information, the 3420 new textbooks constitute one-tenth (1/10) of all the textbooks that were already in the library.

Let's denote the total number of textbooks in the library as "x". Therefore, we can set up the following equation:

x - 3420 = (9/10)x

Simplifying the equation, we have:

x - (9/10)x = 3420

Combining like terms, we get:

(1/10)x = 3420

To solve for "x", we can multiply both sides of the equation by 10:

x = 3420 * 10

Calculating the value, we find:

x = 34200

Therefore, the total number of textbooks in the school library is 34,200.

Answer:

The school library now has a total of 34,200 textbooks after receiving 3420 new textbooks.