The afforestation activity of "protecting mother river" has been carried out in a city. Jinqiao village has 1 & nbsp; 000 mu of wasteland, the greening rate is 80%, 300 mu of good land is regarded as greening, and the greening rate of river slope has reached 20%. At present, the greening rate of all the land in Jinqiao village is 60%. How many mu of river slope is there

The afforestation activity of "protecting mother river" has been carried out in a city. Jinqiao village has 1 & nbsp; 000 mu of wasteland, the greening rate is 80%, 300 mu of good land is regarded as greening, and the greening rate of river slope has reached 20%. At present, the greening rate of all the land in Jinqiao village is 60%. How many mu of river slope is there

Suppose there are x mu of river slope land. According to the meaning of the title, 1000 × 80% + 300 + X × 20% = × 60%, the solution is: x = 800. Answer: there are 800 mu of river slope land

The parts processing factory uses 28 pieces of standard copper plates to punch a and B type gaskets. Each copper plate can punch 12 A-type gaskets or 18 B-type gaskets. How many pieces of copper plates are needed to punch a and B type gaskets according to the ratio of 1:2?

Let a be x sheets, then B be 28-x sheets
So a has 12x, B18 (28-x)
AB is 1:2
So B is twice as big as a
SO 2 * 12x = 18 (28-x)
24x=504-18x
42x=504
x=12
28-x=16
A: 12 for a and 16 for B

1. A computer has been used for 1700 hours, and it is estimated that it will be used for another 150 hours every month. After how many months, the use time of this computer has reached the required maintenance time of 2450 hours?
2. Use a 80m long rope to circle a rectangle so that its width is one third of its length. What should be the length and width?
3. The sum of four consecutive odd numbers is 32. What are the four numbers?
4. One of the main players of Wanma basketball team, once again, scored 28 points in 22 shots. In addition to three three-point shots, how many two-point shots and free throws did he make?
5. For a two digit number, the sum of the ten digit number and the one digit number is 11. If the ten digit number and the one digit number are exchanged, the new number will be 63 larger than the original number, and the original two digit number will be obtained

1. After x months, the service time of this computer will reach 2450 hours
1700+150x=2450
x=5
2. Length x width is one third of length = 1 / 3x
2*(x+1/3x)=80
x=30
three
Let the first number be x and the rest be x + 2, x + 4, x + 6
x+x+2+x+4+x+6=32
x=5
The four numbers are 5, 7, 9 and 11
four
He also made x two-point free throws, 14-3-x = 11-x
3*3+2*x+(11-x)=28
x=8
He also made eight two pointers and three free throws
five
The number on the tenth digit x the number on the tenth digit 11-x
The original two digit 10x + 11-x = 11 + 9x
The new number 10 * (11-x) + x = 110-9x is obtained by transposing the number on the ten and the number on the individual
110-9x-63=11+9x
x=2
The original two digit number is 29

Whether it's Or Translate this phrase into English

no matter...or...

How much is the surface area and volume of a cuboid made up of two cuboids with an edge length of 8 cm?

640 1024

It is known that the edge length of the cube abcd-a1b1c1d1 is 1, and the area of the triangle can be calculated through vertex D1, a and C

Equilateral triangle, becoming 2 ^ (1 / 2)
s=1/2*3^(1/2)

How to make you healthy

Healthy habits are very important for us,we must have enough food to keep us healthy.Breakfast is necessary,it gives us energy for the morning.We must also have right kinds of food to keep us healthy....

In primary school, what are the types of articles
In primary school, the article styles can be divided into (), (), (), (), ()
The articles mainly composed of (), (), (), () all belong to narration

Narrative, expository, argumentative, practical

If we know that D and E are the points on AB and AC of △ ABC, and ad: DB = 1:3, AE: EC = 2:1, then s △ ade: s quadrilateral bced = ()
A.1:3 B.1:4 C.1:5 D.1:6
It's due on the 7th!

AD:AB=1/4
AE:AC=2/3
ADE:ABC=1/4 *2/3=1/6
ADE:BCED=1/5

Fill in the blanks with the prepositions at, in, on, under, behind, near, of. The door () the classroom is open

of