Question

Три тракториста вспахали 315 га земли. Первый вспахал 4/7 всей земли, второй 5/21. Сколько гектаров земли вспахал третий тракторист

Answer 1

4/7= 12/21
21/21 - 12/21 - 5/21= 4/21
315/21=15 (1/21)
15*4=60
Ответ: 60 га.

Answer 2

1)4/7+5/21=17/21(га)-скопали 1 и 2
2)1-17/21=4/21(га)
Ответ:4/21 га вскопал 3

Answer 3

Calculation of Land Plowed by the Third Tractor Driver

To calculate the amount of land plowed by the third tractor driver, we need to subtract the land plowed by the first two tractor drivers from the total area of 315 hectares.

The first tractor driver plowed 4/7 of the total land, which is approximately (4/7) * 315 = 180 hectares. The second tractor driver plowed 5/21 of the total land, which is approximately (5/21) * 315 = 75 hectares.

To find the land plowed by the third tractor driver, we subtract the land plowed by the first two drivers from the total area: 315 hectares - 180 hectares - 75 hectares = 60 hectares.

Therefore, the third tractor driver plowed approximately 60 hectares of land