Question

1.Учащиеся младших классов составляют 45%всех учащихся школы. Учащихся с 5 по 9 классы на 130% больше, чем 10-11 классов. Сколько в школе старшеклассников, если в ней учится 1500 человек?

Answer 1

С 5 по 11 класс: 100%-45%=55%      1500*0,55=825 уч.
х - старшеклассников (100%)
тогда 5-9 будет 100%+130% (на 130% больше сказано)=230%
Тогда 5-11 будет 100% (10-11)+230%=330%
Имеем 330% это 825 уч.
3,3х=825
х=825/3,3=250
Ответ: старшеклассников 250.

Answer 2

Пусть x -всего учащихся. Получаем уравнение Х-0,45Х=285 и решаем.Получается 700

Answer 3

Problem Analysis

We are given the following information: - Students in the lower grades make up 45% of the total number of students in the school. - The number of students in grades 5 to 9 is 130% more than the number of students in grades 10 and 11. - The total number of students in the school is 1500.

We need to determine the number of high school students in the school.

Solution

Let's break down the problem step by step:

1. Calculate the number of students in the lower grades: - We know that students in the lower grades make up 45% of the total number of students in the school. - To find the number of students in the lower grades, we can multiply the total number of students by 45%: 45% of 1500 = 0.45 * 1500 = 675.

2. Calculate the number of students in grades 5 to 9: - We know that the number of students in grades 5 to 9 is 130% more than the number of students in grades 10 and 11. - Let's assume the number of students in grades 10 and 11 is x. - The number of students in grades 5 to 9 would then be x + 130% of x. - Mathematically, this can be represented as: x + 1.3x = 2.3x. - We can set up an equation using the given information: 2.3x = 1500 - 675. - Solving this equation will give us the value of x, which represents the number of students in grades 10 and 11.

3. Calculate the number of high school students: - The number of high school students is the sum of the number of students in grades 10 and 11. - We can calculate this by multiplying the value of x by 2: 2 * x.

Let's calculate the number of high school students using the given information:

1. Calculate the number of students in the lower grades: - 45% of 1500 = 0.45 * 1500 = 675.

2. Calculate the number of students in grades 5 to 9: - 2.3x = 1500 - 675 - 2.3x = 825 - x = 825 / 2.3 - x ≈ 358.70 (rounded to the nearest whole number)

3. Calculate the number of high school students: - 2 * x = 2 * 358.70 ≈ 717.40 (rounded to the nearest whole number)

Therefore, there are approximately 717 high school students in the school.

Answer

Based on the given information, there are approximately 717 high school students in the school.