Question

В школьной библиотеке было одинаковое число учебников по русскому языку и математике. после того как привезли ещё 200 учебников, учебников по русскому языку стало 800, а по математике 900. сколько учебников по русскому языку и по математике было в библиотеке?

Answer 1

100 И 100 ЛЕГКО ТУПИЗМ

Answer 2

1) 200:2=100(у) к каждому 2)800-100=700( у) по русскому языку. 2)900-100=800(у) по математики Ответ: 700 учебников по русскому, 800 по математики.

Answer 3

Problem Analysis

In the school library, there was an equal number of textbooks for Russian language and mathematics. After 200 more textbooks were brought in, there were 800 textbooks for Russian language and 900 textbooks for mathematics. We need to determine the initial number of textbooks for Russian language and mathematics in the library.

Solution

Let's assume that the initial number of textbooks for Russian language and mathematics in the library was x.

After 200 more textbooks were brought in, the number of textbooks for Russian language became x + 200, and the number of textbooks for mathematics became x + 200.

According to the given information, after the addition of 200 textbooks, there were 800 textbooks for Russian language and 900 textbooks for mathematics.

We can set up the following equations based on the given information:

Equation 1: x + 200 = 800 (number of textbooks for Russian language after addition) Equation 2: x + 200 = 900 (number of textbooks for mathematics after addition)

To find the initial number of textbooks for Russian language and mathematics, we need to solve these equations.

Solving the Equations

Let's solve Equation 1 for x:

x + 200 = 800

Subtracting 200 from both sides:

x = 800 - 200

Simplifying:

x = 600

So, the initial number of textbooks for Russian language in the library was 600.

Now, let's solve Equation 2 for x:

x + 200 = 900

Subtracting 200 from both sides:

x = 900 - 200

Simplifying:

x = 700

So, the initial number of textbooks for mathematics in the library was 700.

Answer

Therefore, there were 600 textbooks for Russian language and 700 textbooks for mathematics in the school library.

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