Question

Тракторная бригада за три дня должна вспахать 156 га. В первый день она вспахала 4/13 намеченной площади, во второй день -5/12 намеченной площади. Какую площадь должна вспахать бригадв за третий день?

Answer 1

Какая часть осталась на третий день?
1-4/13-5/12=43/156
Пропорция: 
156 ---------------------------------- 1 
х ------------------------------------- 43/156
х=156:156×43
х=43 га столько нужно вспахать в третий день

Answer 2

Calculation of the Area Plowed by the Tractor Brigade

To calculate the area that the tractor brigade should plow on the third day, we need to subtract the areas already plowed on the first and second days from the total area of 156 hectares.

1. Area plowed on the first day: 4/13 of the total area. 2. Area plowed on the second day: 5/12 of the total area.

To find the area that remains to be plowed on the third day, we subtract the sum of the areas plowed on the first and second days from the total area:

Remaining area = Total area - Area plowed on the first day - Area plowed on the second day

Let's calculate it step by step:

1. Area plowed on the first day: (4/13) * 156 hectares = 48 hectares. 2. Area plowed on the second day: (5/12) * 156 hectares = 65 hectares.

Now, let's calculate the remaining area:

Remaining area = 156 hectares - 48 hectares - 65 hectares = 43 hectares.

Therefore, the tractor brigade should plow 43 hectares on the third day.