Question

В классе всего 17 парт. За 3 партами сидит по 1 человеку, а за остальными по 2. Сколько учеников в классе? Реши задачу выражением

Answer 1

(17-3)*2+3=14*2+3=28+3=31 учеников.

Ответ:в классе 31 учеников.

Answer 2

(17•2)-3=31 ну я считала так что количество парт умножила в 2 раза,а потом вычла сколько человек сидят на одной парте т.е. 3

Answer 3

Problem Analysis

We are given that there are a total of 17 desks in a classroom. Behind 3 of the desks, there is only 1 student sitting, while behind the rest of the desks, there are 2 students sitting. We need to determine the total number of students in the classroom.

Solution

Let's denote the number of desks with 1 student as `x` and the number of desks with 2 students as `y`. We know that `x + y = 17` (since the total number of desks is 17).

We are also given that behind 3 desks, there is only 1 student sitting. This can be represented as `x = 3`.

To find the value of `y`, we can substitute the value of `x` into the equation `x + y = 17`: ``` 3 + y = 17 y = 17 - 3 y = 14 ```

Therefore, there are 14 desks with 2 students sitting.

To find the total number of students in the classroom, we can add the number of students behind the desks with 1 student (`x`) and the number of students behind the desks with 2 students (`y`): ``` Total number of students = x + y = 3 + 14 = 17 ```

So, there are 17 students in the classroom.

Answer

There are 17 students in the classroom.