Good math helps. Calculate the proportions.

Dear, the known conditions are not sufficient, judging from the number you gave, you can only think that the number is equal to each other. Then 1 catty is fully ripe, and 6 is ripe; Seven maturity is catty.

If you want to know how much a piece of elbow will weigh when it is cooked, just use the weight of the elbow * the number you want. For example: the six mature catties of that catty.

Unripe: 1 catty.

Fully cooked: catties. Add a total of 10 times cooked: catty.

Enlarge times. One becomes: catties.

1+ catties (one catty belly six mature).

1 + pound (one pound belly seven mature).

Still: unripe: catty.

According to the above, the same expands the times.

One becomes: catties.

Six mature: catty.

Unripe: Fully ripe = 1:

One layer is a multiple of the unripe, and an unripe weight is added after the result is calculated.

Set the unripe weight n catties, and the number of layers is m

Get the formula:

The general way to solve the ratio is that the product of the outer term is equal to the product of the inner term.

For example, a ratio a:b=c:d, where a and d are external terms, and b and c are internal terms, can obtain ad=bc.

Suppose you find the ratio of the unknown x:

3：5=x：15

According to the product of the outer term is equal to the product of the inner term:

3*15=5*x

5x=45x=9Isn't it very simple to solve your example problem in this way?

x/y=（2y）/（x-y）

x²-xy=2y²

x²-xy-2y²=0

x-2y）（x+y）=0

x=2y or x=-y

Dear, please [adopt the answer], your adoption is the motivation for me to answer the question, thank you.

Solution: If Xiao Ming brings 6x yuan, then Xiaoli brings 5x yuan; Xiao Ming spends 7y yuan, then Xiao Li spends 5y yuan, and the equation system is obtained according to the topic

6x-7y=25

5x-5y=25

Solve this system of equations to get:

x=10y=5

So the money that Xiao Ming brought is: 6x=6 10=60 (dry teasing yuan) description; In this way, it can be used to check the ignition failure. The money that Xiao Li brought was 50 yuan, the money that Xiao Ming spent was 35 yuan, and the money that Xiao Li spent was 25 yuan. 60/50=6/5；The ratio of spending money is:

Xiao Ming has 36 yuan.

Suppose the total amount of money for two people is x

The two spent a total of y

6x wide opening 11-7y 12=25

5x/11-5y/12=25

The only way to solve the wheel is x=66

Xiao Ming's Laqiaopei money is 6x 11=36

16 people passed The ratio is 5:3 Male 10 female 6 Takes the exam 4:3 Fails 1:1 So 16 men and 12 women A total of 28 people took the exam.

160 qualified people, the qualified male and female ratio is 5 to 3, 5 + 3 = 8, male students are qualified 160 5 8 = 100 (people) female students are qualified 60 people, the unqualified ratio is 1 to 1, if the unqualified male and female students are x people, then (100 + x) :(60 + x) = 5:3

x = 60, a total of 120 male and female students failed, and the number of people who took the test was 120 + 160 = 280.

The total number of qualified men and women is 160, and the ratio of qualified men to women is 5 to 3, so the qualified male students are 160 * 5 8 = 100, and the qualified female students are 160-100 = 60.

The ratio of unqualified is 1 to 1, and there can be x unqualified boys, then the total number of unqualified girls is 100+x, and the total number of girls is 60+x

It is known that the ratio of men to women taking the test is 4 to 3, so (100+x) (60+x)=4 3

Solving the equation yields x=60

So the total number of boys is 160, the total number of girls is 120, and the total number of people who take the exam is 160 + 120 = 280.

1. Solution: Set the distance between the two places xcm. 2. Solution: Set up x blocks.

900km=90000000cm 864：24=x：181：

4000000=x：90000000 24x=864*184000000x=90000000 24x=15552x= x=648

Answer: The distance between the two places. Answer: 648 blocks are used. Loose code.

3. Solution: The actual height of the excavation is xm.

xx=15A: The actual height of the ancient tower is 15m.

1.Because the actual distance from the slippery liquid is pure from the scale bar = the distance on the figure, the first conversion unit is 900km = 900 00 00 0cm, 90000000 1:40000000

3.Let the tomb.

In proportion. Distance Time = Speed (certainly).

Solution: Set the length of the train x meters.

1000+x) 65=(730+x) 50x=170 When solving the equation, the basic property of proportionality is used, and the product of the cross phase is equal.

The length of this train is x meters.

1000 x 65 = 730 x 50 gives x = 170

A: The length of this train is 170 meters.

Let the length of the train be x meters.

1000+x/65=730+x/50

50000+50x=47450+65x

15x=2550

x=170 so the train is 170 meters long.