Question

Известно 1/2 класса пошли в кино,4/7 на выставку. сколько учащихся в классе если их больше 20 и меньше 30

Answer 1

Ответ на фото...... Удачи

Answer 2

Calculating the Number of Students in the Class

To calculate the number of students in the class, we can use the information provided about the fraction of students who went to the cinema and the exhibition.

Given: - 1/2 of the class went to the cinema. - 4/7 of the class went to the exhibition.

Let's denote the total number of students in the class as x.

Calculating the Number of Students Who Went to the Cinema

Using the information provided, we can calculate the number of students who went to the cinema.

1/2 of the class went to the cinema, so the number of students who went to the cinema is: 1/2 * x

Calculating the Number of Students Who Went to the Exhibition

Similarly, we can calculate the number of students who went to the exhibition.

4/7 of the class went to the exhibition, so the number of students who went to the exhibition is: 4/7 * x

Finding the Total Number of Students

We know that the total number of students in the class is more than 20 and less than 30.

So, we need to find a value of x that satisfies the following conditions: - 1/2 * x is an integer (since the number of students cannot be a fraction). - 4/7 * x is an integer. - The value of x is more than 20 and less than 30.

By finding a common multiple of 2 and 7 within the range of 20 to 30, we can determine the total number of students in the class.

Solution

After analyzing the given information, we find that the total number of students in the class is 28.

This is calculated as follows: - 1/2 * 28 = 14 (an integer) - 4/7 * 28 = 16 (an integer)

Therefore, if more than 20 and less than 30 students are in the class, the total number of students in the class is 28.