If the width of a rectangle remains unchanged, its length increases by 8 meters and its area increases by 72 square meters; if the length remains unchanged and its width decreases by 4 meters, its area decreases by 48 square meters. Then the original area of the rectangle is () square meters A. 100B. 108C. 180D. 200

The original width: 72 △ 8 = 9 (m); the original length: 48 △ 4 = 12 (m); the area of the original rectangle: 12 × 9 = 108 (M2). Answer: the area of the original rectangle is 108 m2. So choose B

If the length of the rectangle increases by 8 meters or the width increases by 4 meters, the area of the rectangle orchard will increase by 144 square meters,

144 △ 4 = 26 (m) = original length
144 △ 8 = 18 (m) = original width
18×26＝468（㎡）
A: the original area is 468 square meters

If the width of a rectangle remains unchanged, its length increases by 8 meters and its area increases by 72 square meters; if the length remains unchanged and its width decreases by 4 meters, its area decreases by 48 square meters. Then the original area of the rectangle is () square meters
A. 100B. 108C. 180D. 200

The original width: 72 △ 8 = 9 (m); the original length: 48 △ 4 = 12 (m); the area of the original rectangle: 12 × 9 = 108 (M2). Answer: the area of the original rectangle is 108 m2. So choose B

The area of a rectangular grassland is 144 square meters, 18 meters long. How many meters wide is it?

Width: 144 △ 18 = 8M

If the length of a rectangle increases by 2 meters, the area will increase by 12 square meters; if the width increases by 1 meter, the area will increase by 8 square meters

Let the length and width of a rectangle be a and B respectively
1. From "the length increases by 2 meters, the area increases by 12 square meters", we get 2 × B = 12, B = 6 meters (the width remains the same, use the increased area equation)
2. From "the width increases by 1 meter, the area increases by 8 square meters", we can get 1 × a = 8, a = 8 meters (the length does not change, use the increased area equation)
3. S = a × B = 8 × 6 = 48 square meters

The width of the first rectangle is 8 meters and the area is 248 square meters. The width of the second rectangle is 21 meters and the length of the two rectangles is equal. What is the area of the second rectangle

Length = 248 △ 8 = 31m
Area = 31 × 21 = 651 square meters

A rectangular piece of land is 42 meters long and 5 / 7 of its length wide. How many square meters is the area of the land

A rectangular lawn, the perimeter is 240 meters, the ratio of length and width is 3:2, how many square meters is the area of this lawn? How to do this problem? What is the formula?
240/2/(3+2)=24cm
24*3=72cm
24*2=48cm
72*48=3456cm2
Answer supplement
Wrong unit: 240 / 2 / (3 + 2) = 24m
24*3=72m
24*2=48m
72*48=3456m2

A rectangular land is 42 meters wide and twice as long as wide. How many square meters is the area of this land?

The area of this land is: 42x2x42 = 3528 (square meters)

A rectangular piece of land is 120 meters long and 90 meters wide. Divide it into two pieces according to the ratio of 7:5. What is the area of each piece of land?
A rectangular piece of land, 120 meters long and 90 meters wide, according to 7: how many square meters are the two pieces of land?

120*90*7/12=6300
120*90*5/12=4500

A rectangular piece of land is 24 meters wide and 6 / 7 of its length. How many square meters is the area of this piece of land?
Practical questions

A rectangular piece of land is 24 meters wide and 6 / 7 of its length. How many square meters is the area? Length: 24 △ 6 / 7 = 28 (meters) area: 28 × 24 = 672 (square meters)