Question

Тракторная бригада может вспахать за годину⅛ поля. до обеденного перерыва бригада работала 4 часа. сколько времени она поваинна еще работать, чтобы вспахать все поле

Answer 1

Всё поле примем за единицу (целое).
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1 способ.
1) 1/8 * 4 = 4/8 = 1/2 - часть поля, которую вспашет тракторная бригада за 4 часа;
2) 1 - 1/2 = 1/2 - часть поля, которую останется вспахать;
3) 1/2 : 1/8 = 1/2 * 8/1 = 8/2 = 4 (ч) - столько времени потребуется, чтобы завершить работу.

2 способ.
1) 1 : 1/8 = 1 * 8/1 = 8 (ч) - столько времени потребуется тракторной бригаде, чтобы вспахать всё поле;
2) 8 - 4 = 4 (ч) - столько времени надо ещё пахать после обеда.

Answer 2

Calculation of Time Required to Plow the Field

To calculate the time required for the tractor brigade to plow the entire field, we need to consider the following information:

- The tractor brigade can plow 1/8 of the field in 1 hour. - Before the lunch break, the brigade worked for 4 hours.

To find out how much time is needed to plow the entire field, we can set up a proportion:

1/8 field plowed in 1 hour = x field plowed in y hours

Let's solve this proportion to find the time required for the brigade to plow the entire field.

1/8 field plowed in 1 hour = x field plowed in y hours

1/8 = x/y

Cross-multiplying, we get:

y = 8x

Since the brigade worked for 4 hours before the lunch break, we can substitute x = 4 into the equation:

y = 8 * 4

y = 32

Therefore, the brigade needs to work for an additional 32 hours to plow the entire field.

Please note that this calculation assumes a constant plowing rate throughout the working hours and does not account for factors such as breaks, equipment maintenance, or other interruptions that may affect the actual time required to complete the task.