1=5 2=6 3=8 4=7 5=?

1=5 2=6 3=8 4=7 5=?

Can't hurt. It's one. Man

(x + 7): 6 = 7:2.1, solution ratio

（X+7）：6=7:2.1
2.1(x+7)=42
x+7=20
x=13

What's the percentage of seven out of nine? In addition: three sixths X - one eighth x = nine out of twenty. Thank you

7/9=0.77777777777778≈77.78%
3/6x-1/8x=9/20
3/8x=9/20
x=6/5

7 / 8 to 2.5 = x to 1 / 7 1 / 5 to x = 1 / 2 to 1 / 4 x to 3 / 4 = 7 to 1.4 x / 9 = 1 / 2 solution ratio

7 / 8 to 2.5 = x to 1 / 7
2.5x=7/8*1/7=1/8
x=1/8÷2.5
x=1/20
1 / 5 to x = 1 / 2 to 1 / 4
1/2*x=1/4*1/5
1/2x=1/20
x=1/20÷1/2
x=1/10
X ratio 3 / 4 = 7 to 1.4
1.4x=7*3/4=21/4
x=21/7÷1.4
x=15/4
x/9=1/2
Double 9
x=9/2
Wrong classification, changed

1: Solution proportion (1) x: 15 = 9 (2) 20: x = 1.25 (3) 3 of 2: x = 3 of 4 (4) x: 3 of 8 = 2 of 7
(5) 0.25: x = 25:20 (6) x: 2 / 5 = 0.4:1 / 2
2: The price ratio of clothes and trousers is 7:5. How much are the clothes and trousers worth?
3: There are 75 large and small cars in the parking lot. The ratio of large and small cars is 1:4. How many large and small cars are there respectively?
4: When building a highway, a kind of concrete with cement, sand and stone ratio of 2:3:5 was used to build the subgrade. Now 400 tons of this kind of concrete is needed. How many tons of cement, sand and stone are needed?

（1）x:15=9
x/15=9
x=135
（2）20:x=1.25
20/x=1.25
x=16
(3) 3 / 2: x = 3 / 4
x=2
(4) X: 3 / 8 = 2 / 7
x=3/28
2: The price ratio of clothes and trousers is 7:5. How much are the clothes and trousers worth?
120 / 12 = 10 clothes = 10 * 7 = 70 pants = 10 * 5 = 50
3: There are 75 large and small cars in the parking lot. The ratio of large and small cars is 1:4. How many large and small cars are there respectively?
75÷5=15
Cart = 15
Trolley = 15 * 4 = 60
When building a highway, a kind of concrete with cement, sand and stone ratio of 2:3:5 was used to build the subgrade. Now 400 tons of this kind of concrete is needed. How many tons of cement, sand and stone are needed?
400÷【2+3+5】=40
Cement = 40 * 2 = 80
Sand = 40 * 3 = 120
Stone = 40 * 5 = 200

The solution ratio is 1 / 2: 2 / 7 = 1 / 3: (4-x)_

1 / 2: 2 / 7 = 1 / 3: (4-x),
1/3×2/7=1/2(4-x)
2/21=1/2(4-x)
4=21(4-x)
4=84-21x
21x=84-4
21x=80
x=80/21

Solution ratio: three seventh to one x equals one fifth to one eighth
Using the proportional equation, please write the calculation process and results,

3/7:1/x=1/5:1/8
1/(5x)=3/56
15x=56
x=56/15

Solution ratio X: 0.04 = 0.5 (1 + 1 / 8). Quarter: 1 / 7 = 1 / 3: (4 minus x). Eighth: 1 / 4 = 1 / 10: X
(x minus 1): nine and one fifth = 0.1: nine and one fifth

Solution ratio
10: 0.04 = 0.5: (1 + 1 / 8)
9/8x=0.04×0.5
9/8x=0.02
x=4/225
One quarter: one seventh = one third: (4 minus x)
1/4(4-x)=1/7×1/3
1/4(4-x)=1/21
4-x=4/21
X = 3 and 17 / 21
One eighth: one fourth = one tenth: X
1/8x=1/4×1/10
1/8x=1/40
x=1/5
(x minus 1): nine and one fifth = 0.1: nine and one fifth
9 and 1 / 5 (x-1) = 0.1 × 9 and 1 / 5
x-1=0.1
x=1.1

How to solve the proportion, X: 12 = 3 / 4:1 / 8

10: 12 = 3 / 4:1 / 8
x:12=6
Then x = 12 * 6
Then x = 72

6 (1 / 2 x-4) + 2x = 7 - (1 / 3 x-1) find the value of X