Question

Задача. трактористы вспахали поле за три дня. в первый день 4/7 поля, во второй 40% поля, а в третий остальные 48га. найдите площадь поля. помогите пожалустаа

Answer 1

40%=4/10=2/5

все поле 1

1-4/7-2/5=35/35-20/35-14/35=1/35 поля вспахали в третий день

1/35-48га

      1-Хга

Х=1*48:1/35=48*35/1=1680га площадь поля

 

1680:7*4=960га вспахали в первый день

1680*40%=672га вспахали во второй день

1

Answer 2

40%=4/10=2/5

все поле 1

1-4/7-2/5=35/35-20/35-14/35=1/35 поля вспахали в третий день

1/35-48га

      1-Хга

Х=1*48:1/35=48*35/1=1680га площадь поля

 

1680:7*4=960га вспахали в первый день

1680*40%=672га вспахали во второй день

1680-(960+672)=48га вспахали в третий день

Answer 3

Problem Analysis

We are given that a group of tractor drivers plowed a field in three days. On the first day, they plowed 4/7 of the field, on the second day they plowed 40% of the field, and on the third day, they plowed the remaining 48 hectares. We need to find the total area of the field.

Solution

To find the total area of the field, we need to add up the areas plowed on each day.

Let's denote the total area of the field as A.

On the first day, they plowed 4/7 of the field, which is equal to (4/7) * A.

On the second day, they plowed 40% of the field, which is equal to (40/100) * A.

On the third day, they plowed the remaining 48 hectares, which is equal to 48 hectares.

Adding up these areas, we can set up the following equation:

(4/7) * A + (40/100) * A + 48 = A

To solve for A, we can simplify the equation and solve for A.

Calculation

Let's calculate the total area of the field.

(4/7) * A + (40/100) * A + 48 = A

Multiplying both sides of the equation by 100 to get rid of the fractions:

(400/700) * A + (40/100) * A + 4800 = 100A

Simplifying the fractions:

(4/7) * A + (2/5) * A + 4800 = 100A

Combining like terms:

(20/35) * A + (14/35) * A + 4800 = 100A

(34/35) * A + 4800 = 100A

Subtracting (34/35) * A from both sides:

4800 = 100A - (34/35) * A

Multiplying both sides by 35 to get rid of the fraction:

4800 * 35 = 3500A - 34A

168000 = 3466A

Dividing both sides by 3466:

A = 168000 / 3466

A ≈ 48.47 hectares

Answer

The total area of the field is approximately 48.47 hectares.