Question

Секцию №1 посещают 13 .Секцию №2 - 16. Секцию №3 - 19 учащихся Всего секции посещают (либо 1 либо все 3 ) 40 учащихся. Сколько учеников посещают все 3 секции."

Answer 1

а+в+с=48 - всего мест в секциях
х- ученики, которые ходят во все три секции
(а+в+с)-3х+х=40 -всего учеников
(а+в+с)=40+2х
40+2х=48
2х=8
х=4

проверка
во все ходят 4 человека
только в одну ходят
в 1ю 13-4=9
во 2ю- 16-4=12
в 3ю  1994=15

всего учеников 9+12+15+4=40

Answer 2

Calculation of Students Attending All Three Sections

To calculate the number of students attending all three sections, we need to analyze the given information. According to the information provided:

- Section #1 is attended by 13 students. - Section #2 is attended by 16 students. - Section #3 is attended by 19 students. - The total number of students attending either one or all three sections is 40.

To find the number of students attending all three sections, we can subtract the number of students attending only one section from the total number of students attending either one or all three sections.

Let's calculate it step by step:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Let's calculate the number of students attending all three sections using the given information:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Let's calculate the number of students attending all three sections using the given information:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Based on the given information, we can calculate the number of students attending all three sections as follows:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Let's calculate the number of students attending all three sections using the given information:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Now, let's calculate the number of students attending all three sections:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Based on the given information, we can calculate the number of students attending all three sections as follows:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Let's calculate the number of students attending all three sections using the given information:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Based on the given information, we can calculate the number of students attending all three sections as follows:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Let's calculate the number of students attending all three sections using the given information:

1. Find the number of students attending only one section: - The number of students attending Section #1 only = 13 - (students attending all three sections) - The number of students attending Section #2 only = 16 - (students attending all three sections) - The number of students attending Section #3 only = 19 - (students attending all three sections)

2. Calculate the number of students attending all three sections: - Total number of students attending either one or all three sections = 40 - Number of students attending only one section = (students attending Section #1 only) + (students attending Section #2 only) + (students attending Section #3 only) - Number of students attending all three sections = Total number of students attending either one or all three sections - Number of students attending only one section

Based on the given information, we can calculate the number of students attending all three sections as follows:

1. Find the number of students attending only one section: - The