Question

40% учеников класса пошли в кино, а остальные 12 человек на выставку. Сколько учащихся в классе?

Answer 1

Ответ:

20 учащихся.

Пошаговое объяснение:

12 человек это 60% пошли на выставку. Значит 12*40:60 = 8 человек пошли в кино, 12 + 8 = 20 человек в классе.

Answer 2

Ответ: 20 учащихся

Пошаговое объяснение:

1) 100 - 40 = 60% - люди, составляющие 12 человек

2) 60 : 12 = 5% - составляет 1 человек

3) 100 : 5 = 20 - количество учащихся в классе

P.S. Отметь, пожалуйста, моё решение как лучшее;)

Answer 3

Calculation of the Number of Students in the Class

To determine the number of students in the class, we need to add the number of students who went to the cinema (40% of the class) and the number of students who went to the exhibition (12 students).

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

According to the given information: - 40% of the class went to the cinema, which is equal to 0.4x. - 12 students went to the exhibition.

To find the total number of students in the class, we can set up the following equation:

0.4x + 12 = x

Solving this equation will give us the value of "x", which represents the total number of students in the class.

Let's solve the equation:

0.4x + 12 = x

Subtracting 0.4x from both sides:

12 = 0.6x

Dividing both sides by 0.6:

x = 12 / 0.6

x = 20

Therefore, there are 20 students in the class.