Question

6тракторов за 7 часов вспахали 36 га.Сколько гектаров смогут вспахать 7 таких же тракторов за 9 часов?ПРОПОРЦИЕЙ ПОЖАЛУЙСТА!!!!ДЛЯ 6 класса!

Answer 1

1) За 7 часов работы:
6 тракторов - 36 га
1 трактор - ? га
1*36:6 = 6 га - вспахал 1 трактор за 7 часов

2) За 9 часов работы один трактор:
6 га - 7 час
? га - 9 час
6*9:7 (га) - вспашет 1 трактор за 9 часов

3) За 9 часов работы 7 тракторов:
1 трактор - 6*9/7 га
7 тракторов - ?
(6*9:7) *7 = 6*9 = 54(га)

Ответ: 54 га смогут вспахать 7 тракторов за 9 часов

Answer 2

Calculation of Hectares Plowed

To solve this problem using proportions, we can set up a ratio between the number of tractors and the number of hectares plowed.

Let's denote the number of hectares plowed by 6 tractors in 7 hours as "x". We can set up the following proportion:

6 tractors / 7 hours = x hectares / 36 hectares

To find out how many hectares can be plowed by 7 tractors in 9 hours, we need to solve for "x" in the proportion:

7 tractors / 9 hours = x hectares / ?

To solve this proportion, we can cross-multiply and then divide:

7 tractors * ? = 9 hours * x

? = (9 hours * x) / 7 tractors

Now, we can substitute the value of "x" from the first proportion into the second proportion:

? = (9 hours * 36 hectares) / (7 tractors * 7 hours)

Simplifying the expression:

? = (9 * 36) / (7 * 7) hectares

Calculating the expression:

? = 324 / 49 hectares

Therefore, 7 tractors can plow approximately 6.61 hectares in 9 hours.

Please note that this calculation is based on the given information and the assumption that the rate of plowing remains constant for the given number of tractors and hours.