The perimeter of a rectangular lawn is 36 meters, and the known length is twice the width. How many square meters is the area of this rectangular lawn

The perimeter of a rectangular lawn is 36 meters, and the known length is twice the width. How many square meters is the area of this rectangular lawn

If the width is x meters, the length is 2x meters
2（2x+x)=36
x=6,2x=12
6x12 = 72 square meters

The perimeter of a rectangular vegetable field is 48 meters, and the width accounts for 3 / 5 of the length. How many square meters is the area of this rectangular vegetable field

L + W = 24m
Because width accounts for three fifths of length
So eight fifths of the length is 24 meters
Length = 15m
Width = 9 m
Area = L * w = 9 * 15 = 135m2

1. The circumference of a rectangular vegetable field is 240 meters, and the ratio of length to width is 5:3. What is the area of this vegetable field?
2. To lay an oil pipeline, it takes 100 days for team a to lay it alone, and 150 days for team B to lay it alone. If it takes 20 days for team a to lay it first, how many days will it take for team B to lay the rest?
3. Master Li processes a batch of parts. In the first day, he processes 84 parts, accounting for 3 / 10 of the total. In the second day, he processes 5 / 14 of the total. How many parts are processed in the second day?
4. XX read a series of Olympic introduction books. On the first day, he read 1 / 4 of the whole book. On the second day, he read 2 / 5 of the whole book. Finally, there are 14 pages left. How many pages are there in this story book?
Give me a formula

1. Set the length as X and width as y. set the equations 2x + 2Y = 240; X: y = 5:3, and solve x = 75, y = 45, so the area is 75 * 45 = 3375
2. Engineering problems. The total workload is 1, the efficiency of a is 1 / 100, and the efficiency of B is 1 / 150, so it takes X days to set. Set the equation 20 * (1 / 100) + X * (1 / 150) = 1 to get x = 120, so it takes 120 days for B to do it alone
3. On the first day, I finished 3 / 10 of the total, so the total was 84 / (3 / 10) = 280, and on the second day, 280 * (5 / 14) = 100. So I read 100 pages on the second day
4. Finally, the remaining copies are 1-1 / 4-2 / 5 = 7 / 20, so the total number of pages is 14 divided by 7 / 20, which equals 40

There is a rectangular vegetable field with a circumference of 240 meters and a ratio of length to width of 5:3. How many square meters is the area of the rectangular vegetable field?

Dear landlord
[positive solution]
There is a rectangular vegetable field, the perimeter is 240 meters, the ratio of length and width is 5:3, then the area of rectangular vegetable field is 3375 square meters, 240 △ 2 △ 8 = 15, length 15 × 5 = 75, width 15 × 3 = 45
The area is 75 × 45 = 3375 square meters
I wish you every success

There are several ways to make a rectangle out of 210 squares with a side length of 2 cm. Which one has the largest perimeter and which one has the smallest perimeter?

There are six species: 210 × 1, 105 × 2, 70 × 3, 35 × 6, 30 × 7, 15 × 14. The largest is the first, 210 × 2 = 420 cm in length and 12 cm in width. The smallest is 15 × 2 = 30 cm in length and 14 × 2 = 28 cm in width

There are several ways to make a large rectangle with two rectangles 8 cm in length and 3 cm in width. How many centimeters are their circumference?

The first one is (16 + 6) × 2 = 44, the second one is (8 + 12) × 2 = 40

How many different spelling methods are there to make a rectangle with 60 small squares of 1 square centimeter? What is the perimeter of the rectangle?

1*60
2*30
3*20
4*15
5*12
6*10

Use 18 identical small squares to form a rectangle, which can have______ There is a spelling

According to the above analysis, we can see that there are three ways to make a large rectangle with 18 identical small squares, as shown in the following figure: A: there are three different pendulum methods

Put 8 squares with side length of 3 decimeters into a rectangle. What's the perimeter of the rectangle? There are several spelling methods? Are their perimeter the same? Give it a swing

There are 2 kinds in total
(1) 8 in a row, perimeter = 3 × 18 = 54 decimeters
(2) There are 2 rows, 4 in each row, perimeter = 3 × 12 = 36 decimeters

How many different ways to make a rectangle with 48 squares of 1 square centimeter? What are their girths?
Answer in a list of seven
Format of the form:

Length: 48 24 16 12 8
Width: 1 2 3 4 6
Perimeter: 92 52 38 32 28
If you want 7 kinds of words, does the title mean that the square can not be finished?
So there are four or five more
10 9
28 28