Question

у класі 28 учнів. З них 18 відвідують спортивні секції, 12 - музичну школу. яким може бути число учнів, яківідвідують і спортивні секції, і музичну школу? принаймні щось одне із зазначеного?

Answer 1

Объяснение:

18+12= 30

30-28=2

Два учні відвідують і спортивні секції, і музичну школу

Answer 2

1) 18+12= 30
2) 30-28=2
Два учні відвідують спортивні секції, і музичну школу.

Answer 3

Problem Analysis

We are given that there are 28 students in a class, with 18 of them attending sports sections and 12 attending a music school. We need to determine the number of students who attend both sports sections and the music school.

Solution

To find the number of students who attend both sports sections and the music school, we can use the principle of inclusion-exclusion.

We start by adding the number of students attending sports sections and the number of students attending the music school. However, this count includes the students who attend both, so we need to subtract the number of students who attend both to avoid double-counting.

Let's calculate the number of students who attend both sports sections and the music school:

Number of students attending sports sections: 18. Number of students attending the music school: 12.

To find the number of students who attend both, we subtract the number of students attending both from the sum of the two counts:

Number of students attending both = Number of students attending sports sections + Number of students attending the music school - Number of students attending both.

Let's calculate:

Number of students attending both = 18 + 12 - Number of students attending both.

Simplifying the equation, we get:

2 * Number of students attending both = 18 + 12.

2 * Number of students attending both = 30.

Number of students attending both = 30 / 2.

Number of students attending both = 15.

Therefore, there are 15 students who attend both sports sections and the music school.

Answer

The number of students who attend both sports sections and the music school is 15.