Primary 6 Math Problem Solve! ）

500 grams = kilograms.

Because buy 500 grams and get a kilogram.

So in fact, 98 yuan bought a kilogram of tea.

Because Uncle Lee wants to buy kilograms.

So divided, 98 yuan per kilogram of tea, a total of 4 kilograms are needed.

So 4 times 98 = 392 yuan.

The gift rate is 10%, so as long as you buy 2kg, that is, 98 * 4 = 392 yuan.

500 grams is equal to kilograms.

Kilogram. 98 4 = 392 yuan.

Kilogram = 2200 g Kilogram = 50 grams.

Let's say Uncle Li actually buys x grams.

x+x÷500×50=2200

x=2000

2000 500 98 = 392 (yuan).

500 grams = kilograms.

That is, the price of buying kilograms is 98 yuan. Yuan.

Kilogram = 2200 grams 4 times 500 plus and 200 divided by 98

500g=

Consistent with the previous 4.

Payable 98 4 = 392 yuan).

1000g = 2 * 500 g, 2000g = 4 * 500 g, 4*, so I bought four servings. 4*98=392 yuan.

500g=

Consistent with the previous 4.

Payable 98 4 = 392 yuan).

The solution to this problem: first suppose the book you are reading is x pages, and then the book has 4x pages, and according to the sentence "If you read 15 more pages, the ratio of the number of pages read to the number of pages you have not read is 2:3" can make an equation.

x+15):(4x-(x+15))=2:3, in this equation where x+15 is the number of pages to read fifteen more pages, (4x-(x+15)) is the number of unread pages, and then solve this equation, and solve x=25, then the book has 4x pages, that is, there are 100 pages.

The method of this kind of question is: 1. Set the unknown first.

2. Arrange equations according to the question.

3. Solve equations.

With the equation, if you set a total of x pages, then (1 4x 15) pages have been read, and (3 4x-15) pages have not been read, then by the question.

1 4x 15):(3 4x-15)=2:3, and then solve the equation, there is no formula, as long as the equation is OK.

I guess I learned equations in the sixth grade of elementary school.

Let's say you've read x pages originally.

This book is 4x pages long.

Read another 15 pages and you'll find x+15

The one that I didn't read was 15 pages less, which is 4x-15

So (x+15):(4x-15)=2:3

Just solve it.

Get x = 15 pages.

I hope my answer will be helpful to you.

Looking forward to the best and good reviews!

Suppose the book has x pages.

Then Xiao Ming read 1 4*x pages and the number of unread pages is (1-1 4)x=3 4*x pages.

According to "If you read 15 more pages, the ratio of the number of pages read to the number of pages not read is 2:3", we know that (1 4x+15) :(3 4x-15) = 2:3 solves x = 100 pages.

Read another 15 pages, and read 2 (2+3)=2 5

Then 15 pages is 2 5-1 4 = 3 20 of the book

So the book has 15 3 20 = 100 pages.

Solution: There are x pages in this book.

Read: x 4+15

Unread: x-(x 4+15)=3x 4-15, so 3(x 4+15)=2(3x 4-15) gives x=100

There are a total of x pages.

Read: x 4+15

Unread: x-(x 4+15)=3x 4-15, so 3(x 4+15)=2(3x 4-15)x=100

People don't know how to do equations in 6th grade, right?

Top this: Read another 15 pages, read 2 (2 + 3) = 2 5, then 15 pages will account for 2 5-1 4 = 3 20 so the book has 15 3 20 = 100 pages".

If the book has x pages, then:

x/4+15):(x-x/4-15)=2:3

So, x = 100 pages.

1.Unblock Apple X

5 6 multiplied by x - 154) = 4 7 (x-154) to get x = 252 and then multiplied by 5 6 to get 210 apples 252 pears 210

2.Method 1: If the speed of car B is x, then the speed of car A is (x+

x=8080 kmh).

Method 2: The distance traveled by A and B together is 490-130=360 kilometers.

The sum of the speeds of A and B is 360 2 = 180 km/h.

If the velocity of B is regarded as 1 part, then the velocity of A is (1+25) parts, and the sum of the velocities of A and B is (1+1+25) parts.

The speed of car B is 180 (1+1+25 )=180 km/h.

The speed of car A is 180-80 = 100 km/h.

3.Problem analysis: Because the total amount of salt does not change after adding fresh water, it can be used to establish an equal amount relationship.

40 5% = 2 (kg) ......Salt content.

2 2% = 100 (kg) ......Total amount of brine after adding fresh water.

100-40 = 60 (kg) ......The total amount of fresh water added.

1。Set apples x kilograms.

Pears 5 6x kg.

5/6x-154）/（x-154）=4/7x=2525/6x=210

2。Let the speed of car B x km h car A is x(1+25%)490-130=2(x+ x=80 The speed of car B is 80 km h Car A is 80 (1+25%)=100

3。Let's add x kilograms.

40*5%/(40+x)=2% x=60

20 * 8 = 160 (km).

The 160 km train takes 12-8 = 4 (hours), so the speed of the train is 160 4 = 40 (km h), the speed of the coach is 40 + 20 60 (km h), and the whole journey is 60 * 8 = 480 (km).

Car encounters take 480 60 + 40 ) = (hours) passenger car line 60 * = 288 (km).

Train line 40 * = 192 (km).

If he has learned, if he has learned, let the distance be x, then you can get x 8-x 12=20 to get x = 480, that is, the distance is 480 kilometers, and the speed of the passenger car is 60 kilometers per hour, and the truck is 40After X hours of meeting, the formula 60x+40x=480 is obtained, then x = hour, the distance of the bus = 60 multiplied, and then there is no need to teach, hehe, I hope it can help you.

1.If 4x=9y (x y is not 0), then (y:

x）=4：9

2.In a ratio, the product of two outer terms is one-sixth and the other is (3).

3.The construction site used 4 trucks to transport soil in situ, with a total of 90 cubic meters of soil transported per day; If you use the same truck with 6 beams, how many cubic meters of soil can be transported per day? (Proportional solution).

Solution: If you can transport x cubic meters of soil per day, then:

4：6=90:x

Solution: x = 135 cubic meters.

4.There is a batch of square bricks, if put together into a rectangle with a ratio of length to width of 5:4, there are 38 pieces left; If the above rectangle is changed to a large rectangle with one piece of length and one piece of width, it will be 53 pieces less. How many squares are in this batch?

Solution: Solve it with arithmetic!

The number of blocks common to this batch of squares:

220 blocks.