Question

Проходила областная олимпиада по математике. По итогам 1 тура отсеялось 128 участников и во 2 тур прошла только третья часть всех ребят принявших участие 1 туре. Сколько всего ребят приняло участие в 1 туре олимпиады. ? Помогите пожалуйста. Мне 10 лет.

Answer 1

Решение на фото!А мне 12 лет.

Answer 2

Вот решение через уравнение

Answer 3

Calculation of the Total Number of Participants in the First Round

To calculate the total number of participants in the first round of the regional mathematics olympiad, we need to use the information provided. According to the question, 128 participants were eliminated after the first round, and only one-third of the remaining participants advanced to the second round.

Let's denote the total number of participants in the first round as x.

After the first round, 128 participants were eliminated, so the number of participants who advanced to the second round is x - 128.

It is given that only one-third of the remaining participants advanced to the second round. Therefore, we can write the equation:

(x - 128) = (1/3)x

To solve this equation, we can multiply both sides by 3 to eliminate the fraction:

3(x - 128) = x

Expanding the equation:

3x - 384 = x

Simplifying the equation:

2x = 384

Dividing both sides by 2:

x = 192

Therefore, the total number of participants in the first round of the olympiad is 192.