1. Surround the wire 108 cm long into a rectangle, so that the length is 12 cm more than the width. How many meters are the length and width? 2. A barrel of wine is five times as much as B barrel of wine. If 20kg is taken from a barrel and poured into B barrel, then the weight of two barrels of wine is equal. How many kg are the two barrels of wine? The calculation process should be specified

1. Surround the wire 108 cm long into a rectangle, so that the length is 12 cm more than the width. How many meters are the length and width? 2. A barrel of wine is five times as much as B barrel of wine. If 20kg is taken from a barrel and poured into B barrel, then the weight of two barrels of wine is equal. How many kg are the two barrels of wine? The calculation process should be specified

1. Surround the wire 108 cm long into a rectangle, so that the length is 12 cm more than the width. How many meters are the length and width?
The sum of length and width is
108 △ 2 = 54 cm
Long is
(54 + 12) △ 2 = 33cm
Kuan Shi
54-33 = 21 cm
2. A barrel of wine is five times as much as B barrel of wine. If 20kg is taken from a barrel and poured into B barrel, then the weight of two barrels of wine is equal. How many kg are the two barrels of wine?
A is more than B
20 × 2 = 40 kg
A is more than B
5-1 = 4 times
It turns out that B has
40 △ 4 = 10kg
It turns out that a has
10 × 5 = 50 kg

Formula calculation
1. A piece of rectangular paper, the long side is 25cm, and the short side is 14cm. Roll the rectangular paper into a cylinder. What is the circumference of the bottom surface of the cylinder? What is the height of the cylinder? (don't remember at the joint)
2. On a straight road, Xiao Ming and Xiao Gang ride in the opposite direction from a and B, which are 500 meters apart. Xiao Ming travels 200 meters per minute and Xiao Gang 300 meters per minute. How long does it take for them to be 5000 meters apart?

Girth 14 cm, height 25 cm; or girth 25 cm, height 14 cm
(5000-500) / (200 + 300) = 4500 / 500 = 9 minutes

1. When the diameter of a circle increases from 12cm to 16cm, how many square centimeters does the area of the circle increase?
2. How many square decimeters is the area of the largest circle cut in a square with a circumference of 32dm?

1.
Known: 2R = D = 12cm
That is, r = 6cm
So s = π * r * r = 3.14 * 6 * 6 = 113.04 square centimeter
2r'=d'=16cm
That is, R '= 8cm
So s' = π * r '* r' = 3.14 * 8 * 8 = 200.96 square centimeter
So the area of the circle is increased: s' - S = 87.92 square centimeters
2. Let the side length of the square be a and the maximum radius of the circle in the square be r
It is known that 4A = 32dm
That is, a = 8dm
r=a/2=4dm
S Square = a * a = 8 * 8 = 64 square decimeters
S circle = π * r * r = 3.14 * 4 * 4 = 50.24 square decimeter
So the area cut: s square-s circle = 64-50.24 = 13.76 square decimeters