This question is a bit difficult, and the master is advanced!

Here's how:1Let B have x people, then A has 4 5x 30 people, and the equation is.

3/4(x-10)=4/5x-30+10

x = 250 so B has 250 people.

2.Let it be that B has a person, and A has a person. Rule.

y=4 5x-30 3 4(x-10)=y+10 to get "x=250, y=170'

Column equation solution: Let the total number of students in the two schools be x

x+30）*5/9=4/7*x+10

Grasp the invariant problem solving.

The original number of students in School B was 5 9 out of a total of +30.

The current number of students in school B is 4 7 of the total number of students, plus 10 people are the original number.

Solution: If B x people, then A 4 5x-30 people.

x-10)3/4=4/5x-30+10

3/4x-15/2=4/5x-20

1/20x=25/2

x=250250*4 5-30=170 (person) solution to 250 people in B, 170 people in A.

If there are x people in school B, then school A has (people, and later B has x-10 people, and someone A will come out in the end.

10*2=20 is the number of people who differ.

3 3 + 4) - (4 4 + 5) = difference rate.

Number of people with a difference Difference rate = total number of people.

Make a list of equations; School A = School B *4 5-30;

School A +10 = (School B -10) * 3 4

Solving the equation should be fine.

It's so simple to solve the equation: Let the total number of students in the two schools be x

x+30）*5/9=4/7*x+10

1 (m) - 1 (dm) = 90 (cm); 60 (seconds) - 1 (seconds) = 59 (seconds);

1 (m) - 10 (cm) = 90 (cm); 30 (yuan) - 7 (yuan) = 23 (yuan);

1 (m) - 1 (mm) = 999 (mm); 1 (angle) - 9 (points) = 1 (points);

1 (angle) + 1 (min) = 11 (min); 3 (points) < 3 (angles) < 3 (yuan).

60 minutes - 1 second = 59 seconds 1 meter - 10 cm = 90 cm.

30 cm - 7 cm = 23 cm 1 km - 1 cm = 999 cm.

1 dm + 1 cm = 11 cm 3 cm < 3 dm < 3 m.

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April, June, and September are 30 days, 31 days from the month to October 1st, 30 + 30 + 30 + 31 + 31 + 31 = 183 days, and then 9 days later, it is October 10, a total of 183 + 9 = 192 days 192 = 7 27. . . 3

It is a Saturday when three days have passed on Wednesday.

October 10 is Monday.

What does it mean when you minus 10? Yes +10-1 Not -10+1

Branches and flowersBudsWait to open and reach outHugoneHug

Lift your feet quicklyRun,Unexpectedly, a small amount of water was grindedbubble,

With a knifePlanerThe pit is very difficult, order ** to release the whipCannon,

Food in the stomach isSatiety,withcellsBrothers were born on the same day.

The cross-sectional area of the cylinder is, the radius of the cylinder is 1dm, the side area of the cylinder is 12*(2*, the surface area of the cylinder is.

Original formula = exp{n*ln[tan(pi 4+2 n)]} to find the limit = exp{power to find the limit}

Let the speed of the driving shaft be no, and the speed of the output shaft is nb; The transmission ratio is i; There is a belt drive in the middle and 4 external meshes, so the direction of rotation of the output shaft is the same as that of the driving shaft; There are a total of six gear ratios; Therefore, the total transmission ratio i=no nb:

When the position is shown in the figure, the transmission ratio = i6 = 3, that is, the highest speed of the output shaft, and the speed of the output shaft nb:

nb=1440/3=480r/min；

v A Hengxun = 42 km hours, v B = x 42 km hours, t = 3 hours 36 minutes = hours s A + s B: s remaining = 3:2

Find: s A B trapped leak = s A + s B + s remaining.

Solution: s jia wang block rot = v jia xt = 42 x =

s B = v B xt = x 42 x =

Because s A + s B : s left = 3 : 2

:s left =3 :2

So s left=

s A B = + =

Answer: The highway between A and B is kilometers long.

FYI.

There seems to be ambiguity in the question stem, does the remaining distance ratio refer to the ratio of the distance between the intersection point of the two cars to the current distance between the two cars?