Question

В школе 900 учащихся. сколько учащихся в начальных классах,если известно,что в начальных классах их в 3 раза больше,чем в старших,и в 2 раза меньше,чем в средних?

Answer 1

Пусть в старших классах х учащихся, тогда в начальных классах (3х) уч, в средних -(6х) уч. 
3х+6х+х=900 
10х=900 
х=90-в старших 
90*3=270-в начальных 
90*6=540-в средних. 
Проверка: 90+270+540=900-всего

Answer 2

Calculating the Number of Students in Different Classes

To calculate the number of students in the different classes, we can use the information provided in the question and the search results.

Given: - Total number of students in the school: 900 - Number of students in the initial classes is 3 times the number of students in the senior classes - Number of students in the initial classes is 2 times the number of students in the middle classes

Let's denote: - Number of students in the senior classes as S - Number of students in the initial classes as I - Number of students in the middle classes as M

We can express the relationships between the classes as follows: 1. I = 3S (Number of students in the initial classes is 3 times the number of students in the senior classes) 2. I = 2M (Number of students in the initial classes is 2 times the number of students in the middle classes) 3. I + S + M = 900 (Total number of students in the school is 900)

Calculating the Number of Students in Each Class

Using the given relationships, we can solve for the number of students in each class.

From the first relationship, we can express S in terms of I: S = I / 3

From the second relationship, we can express M in terms of I: M = I / 2

Substituting these expressions into the total number of students equation: I + (I / 3) + (I / 2) = 900

Solving for I: I + (1/3)I + (1/2)I = 900 (6/6)I + (2/6)I + (3/6)I = 900 (11/6)I = 900 I = 900 * (6/11) I = 490.91

Conclusion

The number of students in the initial classes is approximately 491.