1. A circle has a radius of 4cm, a diameter of () and an area of () 2. A circle has a diameter of 9decimeters, a radius of () and an area of () 3. The radius of a circle is 20cm, the diameter is (), and the area is () 4. The diameter is 6m, the radius is () and the area is ()

1. A circle has a radius of 4cm, a diameter of () and an area of () 2. A circle has a diameter of 9decimeters, a radius of () and an area of () 3. The radius of a circle is 20cm, the diameter is (), and the area is () 4. The diameter is 6m, the radius is () and the area is ()

1. A circle has a radius of 4 cm, a diameter of (8 cm) and an area of (50.24 square cm). 2. A circle has a diameter of 9 decimeters, a radius of (4.5 decimeters) and an area of (63.585 square decimeters)
2. A circle has a radius of 20 cm, a diameter of 40 cm and an area of 1256 square cm
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One quarter of class A is equal to one third of class B. what is the ratio between Class A and class B?

1 / 4 a = 1 / 3 B;
At the same time, divide by B and multiply by 4;
have to
A: B = 4:3

If one ninth of class A is transferred to class B, the number of the two classes is equal. The ratio of the original number of class A and class B is 9:7,

There are x people in class A
Then class B has x * (1-1 / 9) - X / 9 = 7x / 9
Then the ratio of class A to class B is X: (7x / 9) = 9:7
Yes

When class A transfers 1 / 9 of the total number of people to class B, the number of people in the two classes is equal. What is the original number of people in class a compared with that in class B?

9/7
A-1 / 9A = B + 1 / 9A
B = 7 / 9 A
A / (7 / 9a) = 9 / 7

Class A is 9 times 10 times of class B. what is the ratio of class B to class A and class B

10978673430,
The ratio of the total number of class B to class A is:
9：（9＋10）＝9：19
B is the quantity in unit "1"

2 / 3 of class A is equal to 4 / 5 of class B. the number of class A is a fraction of class B (fill in the score); the number of class B is a fraction of class A

2 / 3 of class A is equal to 4 / 5 of class B
The number of class A is 6 / 5 of that of class B; the number of class B is 5 / 6 of that of class A

If one seventh of the students in class A are transferred to class B, the number of students in the two classes will be equal. The number of students in class A is more than that in class B ()
As above

If one seventh of the students in class A are transferred to class B, the number of students in the two classes will be equal
Then 5 / 7 of class a = class B
So the number of class a = the number of class B × 7 / 5
(7/5-1)÷1=2/5
A: Class A has more students than class B (2 / 5)

The ratio of class 6 (1) to class 6 (2) is 8:7. If 8 students in class 6 (1) are transferred to class 6 (2), the ratio of class 6 (1) to class 6 (2) becomes 4:5?

A: there were 48 students in class one and 42 students in class two

If one seventh of the students are transferred from Class A to class B, the number of students in the two classes is equal. What is the ratio of class A to class B?

Hello
Class a unit 1
Class B: 1-1 / 7-1 / 7 = 5 / 7
A: B = 1:5 / 7 = 7:5
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There are two classes in grade six. The number of students in class one is 20% more than that in class two. If 12 students are transferred from class one to class two, the ratio of the two classes is 9:13. How many students are there in each class?

The original ratio of the two classes is: (1 + 20%): 1 = 120%: 1 = 12:10; then the total number of the two classes is: 12 △ (1212 + 10-99 + 13) = 12 △ (1222-922), = 12 △ 322, = 88 (people). Then the original number of the first class is: 88 × 1212 + 10 = 88 × 1222 = 48 (people); the original number of the second class is: 88-48 = 40 (people). Answer: there are 48 people in the first class and 40 people in the second class