Question

Задание 144 1 Фермер посадил на площади 72 га яблони что составляет 40% от всей площади хозяйства сколько гектаров занимает площадь хозяйство фермера 2 в школьной библиотеке 2890 учебников что составляет 85% всех книг имеющихся в библиотеке в библиотеке Сколько всего книг в школьной библиотеке 3 в классе 12 девочек Это составляет 40% всех учеников класса Сколько всего учеников в классе дам 30баллов ​

Answer 1

Пошаговое объяснение:

задача 1

1) 100-40 = 60 (%) - составляет оставшаяся область из под яблонь (S)

2) 72:42 = 1,8 га - 1%

3) 60×1,8 = 108 га - в 60%

4) 72+108 = 180(га)

задача 2

1) 2890:85 = 34 (книг) - 1%

2) 34×100 = 3400 (книг) - 100%

задача 3

1) 12:40 = 0,3 - 1%

2) 100-40 = 60 % (мальчиков)

3) 60×0,3 = 18 (мальчики)

4) 12+18=30 (всего учеников)

Answer 2

Task 1: Calculation of Farm Area

The farmer planted apple trees on an area of 72 hectares, which represents 40% of the total farm area. We need to calculate the total area of the farmer's farm.

To find the total area of the farm, we can use the following formula:

Total Farm Area = (Planted Area * 100) / Percentage

Substituting the given values into the formula, we have:

Total Farm Area = (72 * 100) / 40

Calculating this, we find that the total area of the farmer's farm is 180 hectares.

Task 2: Calculation of Total Books in the School Library

In the school library, there are 2890 textbooks, which represents 85% of all the books in the library. We need to calculate the total number of books in the school library.

To find the total number of books in the library, we can use the following formula:

Total Books = (Number of Textbooks * 100) / Percentage

Substituting the given values into the formula, we have:

Total Books = (2890 * 100) / 85

Calculating this, we find that the total number of books in the school library is 3400.

Task 3: Calculation of Total Students in the Class

In a class, there are 12 girls, which represents 40% of all the students in the class. We need to calculate the total number of students in the class.

To find the total number of students in the class, we can use the following formula:

Total Students = (Number of Girls * 100) / Percentage

Substituting the given values into the formula, we have:

Total Students = (12 * 100) / 40

Calculating this, we find that the total number of students in the class is 30.

Additional Information

It seems you have mentioned "30 points" at the end of your message. However, it is not clear what these points refer to. If you provide more context or clarify your question, I would be happy to assist you further.