I have a question in the sixth grade, and I m in a hurry! Math experts help!

Solution: Let the number B be x, then the number A is two-thirds of 2x

Because: The number A is 1/2 of the number C, so the number C is twice the number of A.

So: C is 2 3x*2, which is equal to 4 3x (four-thirds x) because the sum of 3 is 90

So : x+2 3x+4 3x=90

3x=90x=30

Number A: 30*2 3=20 Number C: 90-30-20=40

Let A be x, then B is 3x of 2, and C is 2x.

x+3/2x+2x=90

Solution: x=20

So A = 20, B = 30, C = 40

It's very simple, you can set three numbers are x y z, and then you can list three tests, two of which are x = or something. Then take those two to the test where the sum of the three numbers is equal to 90, and remove the x. And two x = or something can be written as an equal test without x, and then solve a quadratic equation.

B number = 3 2 A number, C number = 2 A number.

A, B, C, and = 90 = A + 3 2 A + 2 A = 90

De: A = 20

So, B = 30 and C = 40

First set A to x, then x+x3 2+2x=90 to solve x=20

That is, A is equal to 20

From this, it can be calculated that B = 30

C = 40

Let B be x, then A will be (2/3)x and C will be (4/3)x

x+(2/3)x+(4/3)x=90

x=30 then the number A is 20, the number B is 30, and the number C is 40

Let A be a B be 3 2a and C be 2a

So a 3 2a + 2a = 90

So, a=20

b=30c=40

The number B is 3/2 times the number A.

The number C is twice the number of A.

The sum of the three numbers A, B, and C is the number of A (times.

Find the number A is 20, the number B is 30, and the number C is 40

The number of literary books x (1 4) = the number of scientific and technological books x 40% According to the basic nature of the ratio, it can be obtained: the number of literary and artistic books: the number of scientific and technological books = 40%: 1 4 = 8:5

The number of literary books: 273x(8 13)=168The number of scientific and technological books: 273x(5 13)=105.

Set up x books of literature and art, and Y of science and technology books.

2/5y=1/4x

y=5/8x

x+5/8x=273

x=168y=105

Set up x books of literature and art, and 273-x books of science and technology.

1/4x=40%（273-x）

x=x=168

There are 105 science and technology books

Solution: Set up x books of literature and art, and books of science and technology (273-x).

According to the title: 1 4x=40%(273-x)x=168

then (273-x) = 273-168 = 105

A: I bought 168 literary books and 105 science and technology books.

Solution: Set up x books of literature and art, and books of science and technology (273-x).

1/4x=40%（273-x）

x=x=168

273-168 = 105 (Ben).

Answer: There are 168 literary books and 105 science and technology books.

Solution: If there are x books on literature and art, then there are (273-x) x = books on science and technology

x=168……Literary books.

273-x=273-168=105……Science and technology books answer: There are 168 newly purchased literary books and 105 science and technology books.

Set up x books of literature and art. Then the science and technology book is (273-x), and equation 1 4x=40% (273-x) gives x=168,273-x=195

Let's first look at the percentage of literature and art 1 4 in the total number of books, the percentage of 1 4 in the total number of literature and art books is equal to 25 200, multiply the total number of 273 times 25 200 to equal 1 4 of the literature and art books, multiply by 4 to equal the number of literature and art books, multiply the total 273 times 40 200 to equal 40 100 of science and technology books, and multiply by half of the five to equal the number of science and technology books. This question first needs to be divided into a quarter of the literary books or 40 percent of the science books and the total number of 273, so that it is easy to understand.

It's that simple! o( o You're so unsuccessful in math...

How stupid!

It should be done.

1, A walks 1 4 per hour, B walks 1 7 per hour, it can be seen that in the same time, the speed ratio of A and B is 7 4, and the distance ratio is also 7 4

During the period from A's departure to A's return to meet B, B travels 15 3 2 21 kilometers less than A (A returns to meet B 3 kilometers from point B, A walks twice, B does not go once), and in the same time, B travels 4 7 times the distance of A

Therefore, during the period from the departure of A to the return of A and the meeting of B, A traveled 21 (1 4 7) 49 kilometers, so the whole journey is equal to 49 3 46 kilometers.

2. The ratio of the velocity of A and B = (1 4) :(1 7) = 7:4, let A and B be x kilometers apart

x+3）：（x-15-3）=7：4、

x+3）：（x-18）+7：4、

7（x-18）=4（x+3）

7x-126=4x+12、

3x=138、

x=46

The ratio of the velocity of A and B = (1 4) :(1 7) = 7:4, let A and B be separated by x kilometers

x+3）：（x-15-3）=7：4、

x+3）：（x-18）+7：4、

7（x-18）=4（x+3）

7x-126=4x+12、

3x=138、

x=46 should be like this.

24m (Equation Thought, Equivalent Transformation Idea).

Let the distance be xm, x-15+3) (x 7)=(x-3) (x 4) x=24(m).

The proportional method is correct, let's provide a solution 2. The time used by A and B is equal, and the proportional test is set on this condition. That is, the time it takes A to walk X+3 is the same as the time it takes B to walk X-15-3, i.e., X-18. So:

Equation thinking, equivalent transformation thinking).

Let the distance x(km), x-15-3) (x 7)=(x+3) (x 4) be solved to obtain x=46

Why did you end up borrowing 1 from someone else to divide it and end up with 23, kneel down and beg for help!! Hurry.

Now that you already have this sentence, you already know the answer.

The answer is to borrow 1 from elsewhere, a total of 24.

Then the eldest son divided 24 1 2 = 12.

The second son is divided into 24 1 3 = 8.

The younger son is divided into 24 1 8 = 3.

A total of points: 12 + 8 + 3 = 23.

The rest is back, just right.

As for why, you look at those three scores.

Worse 1-23 24 = 1 24

Borrow one, just make up the 1 24, and you can divide it.

Otherwise, the son will have to chop up all the fish and divide it again...

In the end, it was actually one-half, one-third, and one-eighth of the 24 articles, so if such an answer is correct, it is very reluctant. Topics to fool children. After this division, in fact, the eldest gets the least, the third has the most, and the second is in the middle.

The eldest is 1 in 46 less, the second is 1 in 69, and the third is 1 in 184 (compared to 1 in 2, 1 in 3, and 1 in 8). If this question is an arithmetic problem for children, you can not care about it so much.

The second half of the 24 fish to the eldest son is 12, the third of 24 to the second son is 8, and the eighth of 24 to the third son is 3, so 12 + 8 + 3 = 23, and there is one left.

That's it, how can you help if you don't give the question.

What about the mention? What do you do if you don't have a topic???

Equatorial length: 2*km.

40,192 kilometers is about 80,000 miles.

Sitting there for a day, the earth rotates in one circle, which is equivalent to walking 80,000 miles.

The length of the Earth's equator is 6400 2 km = 40192 km = 80384 miles.

One rotation of the Earth is one day, that is, sitting still on the equator, you can travel 80,000 miles in a day.

6400*2*km.

Sitting on the ground, traveling 80,000 miles a day, that is, 40,000 kilometers. That is to say, the earth goes around once a day, and a point on the equator passes through such a length.

That eighty thousand miles said yes.

The earth orbits the sun for 80,000 miles in one day.