Question

В течение дня каждая девочка из 7М класса звонила мальчикам-одноклассникам: первая — 1 раз, вторая — 2 раза, …, 11-я — 11 раз. Каждый мальчику из 7М девочки звонили 3 раза. Сколько учеников в 7М классе?

Answer 1

Ответ:

28 если подсчитать вроде так

Answer 2

Calculation of the Number of Students in Class 7M

To calculate the number of students in class 7M, we need to consider the number of times each girl from the class called her male classmates and the number of times each male classmate received calls from the girls.

According to the given information, each girl from class 7M called her male classmates once more than the previous girl. The first girl called once, the second girl called twice, and so on, until the eleventh girl called eleven times.

On the other hand, each male classmate received calls from the girls three times.

To find the total number of students in class 7M, we can sum up the number of calls made by the girls and divide it by three (since each male classmate received three calls).

Let's calculate the number of calls made by the girls:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 = 66

Now, let's divide the total number of calls by three to find the number of male classmates:

66 / 3 = 22

Therefore, there are 22 students in class 7M.