Question

ЗАДАЧИ НА НАХОЖДЕНИЕ ПРОЦЕНТОВ ОТ ЧИСЛА. 1. Из 25 учащихся класса 40% посещают музыкальную школу. Сколько учеников класса не занимаются музыкой? 2. Из молока получается 10% творога. Сколько творога получится из 42 кг молока?

Answer 1

1) 25---------100%
х----------40%

х=(40*25)/100=10
25-10=15
ответ: 15

2)42-------100%
   х---------10%

х=(42*10)/100=4,2
ответ: 4,2

Answer 2

Task 1: Finding the Number of Students Not Studying Music

To find the number of students in the class who do not study music, we can use the following steps:

1. Calculate the number of students studying music. 2. Subtract this number from the total number of students in the class.

Step 1: Calculate the number of students studying music. - Total number of students in the class: 25 - Percentage of students studying music: 40%

The number of students studying music can be calculated using the formula: ``` Number of students studying music = (Percentage studying music / 100) * Total number of students ```

Applying the formula: ``` Number of students studying music = (40 / 100) * 25 = 0.4 * 25 = 10 ``` Source

Step 2: Calculate the number of students not studying music. - Total number of students in the class: 25 - Number of students studying music: 10

The number of students not studying music can be calculated by subtracting the number of students studying music from the total number of students in the class: ``` Number of students not studying music = Total number of students - Number of students studying music = 25 - 10 = 15 ```

Therefore, there are 15 students in the class who do not study music.

Task 2: Finding the Amount of Cottage Cheese Produced from Milk

To find the amount of cottage cheese produced from 42 kg of milk, we can use the following steps:

1. Calculate the amount of cottage cheese produced from 1 kg of milk. 2. Multiply this amount by 42 to find the total amount of cottage cheese produced from 42 kg of milk.

Step 1: Calculate the amount of cottage cheese produced from 1 kg of milk. - Percentage of cottage cheese produced from milk: 10%

The amount of cottage cheese produced from 1 kg of milk can be calculated using the formula: ``` Amount of cottage cheese = (Percentage of cottage cheese / 100) * Amount of milk ```

Applying the formula: ``` Amount of cottage cheese = (10 / 100) * 1 = 0.1 kg ``` Source

Step 2: Calculate the total amount of cottage cheese produced from 42 kg of milk. - Amount of cottage cheese produced from 1 kg of milk: 0.1 kg - Total amount of milk: 42 kg

The total amount of cottage cheese produced from 42 kg of milk can be calculated by multiplying the amount of cottage cheese produced from 1 kg of milk by 42: ``` Total amount of cottage cheese = Amount of cottage cheese produced from 1 kg of milk * Total amount of milk = 0.1 * 42 = 4.2 kg ```

Therefore, 4.2 kg of cottage cheese can be produced from 42 kg of milk.