Question

В олимпиаде приняли участие 198 учеников.От первых классов-49 человек,это на 20 человек меньше,чем от вторых классов.Остальные участники- ученики третьих и четвёртых классов,поровну от каждой параллели.Сколько учеников четвёртых классов участвовали в олимпиаде?

Answer 1

49+20=69 учеников от 2х классов. Следовательно от третьих и четвертых классов 80 учеников. 198-(49+69) = 80 80/2 т к поровну от каждой параллели. Следовательно 40 учеников от четвертых классов учавствовали в олимпиаде

Answer 2

(198-49-(49+20)) / 2 = 40
ответ: 40 человек

Answer 3

Calculation of the Number of Fourth Grade Students Participating in the Olympiad

To determine the number of fourth-grade students who participated in the Olympiad, we need to analyze the given information.

According to the information provided, a total of 198 students participated in the Olympiad. Out of these, 49 students were from the first grade, which is 20 students less than the number of students from the second grade. The remaining participants were from the third and fourth grades, with an equal number of students from each grade.

Let's break down the information step by step:

1. Total number of participants: 198 students. 2. Number of participants from the first grade: 49 students. 3. Number of participants from the second grade: 49 students + 20 students = 69 students. 4. Number of participants from the third and fourth grades combined: Total participants - (Participants from the first grade + Participants from the second grade) = 198 students - (49 students + 69 students) = 198 students - 118 students = 80 students. 5. Since the number of participants from the third and fourth grades is equal, we divide the total number of participants from these grades by 2 to get the number of participants from each grade: 80 students ÷ 2 = 40 students. 6. Therefore, the number of fourth-grade students who participated in the Olympiad is 40 students.

Please note that the information provided does not specify the number of students from each grade individually, except for the first and second grades. Therefore, we can only determine the number of fourth-grade students based on the given information.