Question

Трактористы вспахали поле за три дня. В первый день они вспахали 3/7 поля, во второй день 40% поля, а в третий день остальные 72 га. найдите площадь поля?

Answer 1

В первый день - 3/7

Во второй день - 40% - это 0,4=4/10=2/5

Все поле - х, это целая часть, т.е. 1

 

Найдем какую часть вспахали в третий день:

1-2/5-3/7=35/35-14/35-15/35=6/35

Получаем:

6/35*х=72

х=72*35/6=420 га

 

Ответ: площадь поля 420 га.

Answer 2

Finding the Area of the Field

To find the area of the field, we can calculate the portion of the field plowed each day and then use that information to determine the total area.

1. Portion Plowed Each Day: - On the first day, 3/7 of the field was plowed. - On the second day, 40% of the field was plowed. - On the third day, the remaining 72 hectares were plowed.

2. Calculating the Total Area: - We can use the information about the portions plowed each day to calculate the total area of the field.

Calculation

Let's calculate the area of the field using the information provided.

1. First Day: - Portion plowed: 3/7 - Let's assume the total area of the field is A. - So, the area plowed on the first day = (3/7) * A

2. Second Day: - Portion plowed: 40% - Area plowed on the second day = 40% of the remaining area after the first day's plowing.

3. Third Day: - The remaining area after the first two days' plowing is 72 hectares.

We can use this information to calculate the total area of the field.

Total Area Calculation

Let's calculate the total area of the field using the given information.

The area plowed on the first day is (3/7) * A. The area plowed on the second day is 40% of the remaining area after the first day's plowing. The remaining area after the first two days' plowing is 72 hectares.

So, we have the equation: (3/7) * A + 0.40 * (A - (3/7) * A) + 72 = A

Solving for A will give us the total area of the field.