The ratio of working time to total amount of work is (), which means ()

The ratio of working time to total amount of work is (), which means ()

Working hours: workload = 5 / 6:7 / 8 = 20 / 21, which means it takes 20 / 21 hours to cultivate one hectare

A tractor ploughs three and two thirds of a hectare a day. The ratio of morning to afternoon is three to two. The number of hectare of afternoon is shown as ()
The ratio of a to B is 2 to 3, the ratio of B to C is 4 to 5, and the ratio of a to C is ()
Do me a favor with these two questions

The number of hectares of cultivated land in the afternoon is: 3 and 3 / 2 divided by 5 times 2
The ratio of a to B is two to three, B is three-thirds of a, B to C is four to five, B is four fifths of C, three fifths of a = four fifths of C, a: C = 8:15

Three tractors a, B and C ploughed a piece of land. A ploughed two fifths of the land. The ratio of cultivated land area between B and C was 5:4. The cultivated land area of B was 200 hectares less than that of A,
How many hectares is the land?

The proportion of cultivated land a is 2 / 5, and that of cultivated land B is (1-2 / 5) × 5 / (5 + 4) = 1 / 3
200 ÷ (2 / 5-1 / 3) = 3000 ha
A: slightly

This tractor ploughs 1 / 6 hectare in one third of an hour. How many hectare in one hour?
How many hours does it take for this tractor to plough a hectare?

This tractor ploughs 1 / 6 hectare in one third of an hour. How many hectare in one hour?
1 / 6 △ 1 / 3 = 1 / 2 (HA)
How many hours does it take for this tractor to plough a hectare?
1 / 3 △ 1 / 6 = 2 (hours)

A tractor can cultivate 2.25 hectares in 4.5 hours. How many hectares can be cultivated in one hour? How many hours does it take to cultivate one hectare

1 hour cultivated land:
2.25 △ 4.5 = 0.5 (HA)
To cultivate 1 hectare of land requires:
4.5 △ 2.25 = 2 (hours)

A piece of land has 910 hectares, which can be cultivated by two tractors in 34 hours. How many hectares can be cultivated by each tractor per hour?

910 ﹣ 34 ﹣ 2 = 65 ﹣ 2, = 35 (HA). A: the average arable land per tractor is 35 ha per hour

A tractor ploughs 7 / 8 hectare of land in 5 / 6 hours. According to this calculation, it takes [] hours to plough one hectare of land, and it can plough [] hectare of land in one hour

1. 5 / 6 divided by 7 / 8 = 20 / 21
2. 7 / 8 divided by 5 / 6 = 21 / 20

A tractor ploughs three fourths of an hour and two tenths of a hectare. How many hectares does it plough per hour on average? How many hours does it take to plough one hectare?

Average tillage per hour: 1 / 2 △ 3 / 4 = 2 / 3 (HA)
1 hectare of cultivated land: 3 / 4 △ 1 / 2 = 3 / 2 (hectare)

How many hectares does a tractor plough in 5 / 8 and 4 / 5 hours per hour

5/8×4/5=1/2
1 / 2 hectare of arable land in 4 / 5 hours
Benefactor, I see your bones are strange,
He is a man of noble bearing and wisdom,
He is a unique talent in the Wulin
If you devote yourself to study, you will become a great tool in the future,
I have a little test, please click next to the answer
"Choose as satisfactory answer"

December 2005 is Monday. Please calculate the day of new year's day in 2008
It's better to have a formula
December 26th

January 1, 2008 is Tuesday
December 26, 2005 is Monday, I learned that January 1, 2006 is Sunday
In 2006 and 2007, 365 days per year,
Two years, a total of 365 + 365 = 730 days;
730/7=104.29
（365+365）-（104*7）
=730-728
=2