Question

В третьих классах школы учятся 100 учеников.Четверть их составляют отличники. В четвёртых классах этой школы учатся 80 учеников. Из них отличники составляют пятую часть . В каких классах отличников больше и на сколько?

Answer 1

В третьих классах - 100 учеников.Отличники - 1/4
В четвёртых классах - 80 учеников.
Отличники - 1/5
1/4 от 100 - 25 отличников в третьих классах
1/5 от 80  - 16 отличников в четвёртых классах
25-16=9
Ответ: на 9 отличников больше в третьих классах

Answer 2

Analysis and Solution

To determine in which classes there are more excellent students and by how much, we need to calculate the number of excellent students in each class.

Let's start by calculating the number of excellent students in the third grade. We are given that there are 100 students in total, and a quarter of them are excellent students.

Number of excellent students in the third grade: - Total number of students: 100 - Quarter of the students are excellent: 100 * 1/4 = 25

Now, let's calculate the number of excellent students in the fourth grade. We are given that there are 80 students in total, and a fifth of them are excellent students.

Number of excellent students in the fourth grade: - Total number of students: 80 - Fifth of the students are excellent: 80 * 1/5 = 16

Comparing the number of excellent students in the third and fourth grades, we can see that there are more excellent students in the third grade (25) than in the fourth grade (16).

To find the difference, we subtract the number of excellent students in the fourth grade from the number of excellent students in the third grade.

Difference in the number of excellent students: - Number of excellent students in the third grade: 25 - Number of excellent students in the fourth grade: 16 - Difference: 25 - 16 = 9

Therefore, there are 9 more excellent students in the third grade than in the fourth grade.

Answer

There are more excellent students in the third grade than in the fourth grade, and the difference is 9 students.