Primary 6 math questions, tonight before 7 30, thank you.

1.40 tons of a ton of coal can be 15 days less, and how many fractions of this pile of coal are burned every day on average? What fraction of a pile of coal is burned in 5 days? How many fractions of a ton are burned per day on average?

1/15=1/15 1/15*5=1/3 40/15=8/3t

1 15 5 days of burning this pile of coal every day 1 3 of burning this pile of coal an average of 8 3t per day

2.1/4 less than (60) kg is 48 kg?

3.There are some books on Xiao Ming's shelves, and there are less than 200 books, of which 1/6 are story books, 1/7 are science and technology books, and there are at most (168) books on the shelves?

6*7=42 42*4=168ben

4.Transporting a batch of goods by car has been transported 6 times, and the goods transported away are more than 3/5, and only 3/3 less than 4 points.

5.The road repair team repaired a section of the road and completed it in two weeks. Three-quarters of a kilometer was repaired in the first week, and three-quarters of the road was repaired in the second week, which is (3) kilometers long.

3/4)/(1-3/4)=3km

Tons of burning for 15 days, fifteenths of a day, five days of fifteenths, that is, one-third, of forty fifteenths of a day, that is, eight-thirds of a ton.

2.64 kg.

42 4 168 200 So there are up to 168 books.

4.Up to 10 days.

Kilometer. By all means.

1.On average, 1/15 of this pile of coal is burned every day, and 1/3 of this pile of coal is burned every 5 days, and 8/3 of a ton is burned on average every day.

2.1/4 less than 64 kg is 48 kg.

3.Up to 168 books can be placed on the shelves.

4.The length of the selected road is 3 km.

1) On average, 1 15 of this pile of coal is burned every day, and 1 3 of this pile of coal is burned every 5 days

Question 1 1 15 1 3 8 3

Question 2 64

Question 3 168

Question 4 B, Question 5: 3 km.

1.An average of 1 15 of this pile of coal is burned every day, and 1 3 of this pile of coal is burned on 5 days, and an average of 8 3 tons of coal are burned per day.

Process: Set x kg, 3x 4 = 48

Because 1/6 is a storybook and 1/7 is a science book, the number is a multiple of 42.

Second, select c process: let each transport x, the total amount is 1, then 3 5<6x<3 4, then 1 10 km process: because the two weeks are completed, the second week repairs 3/4 of this section of the road, then the first week repairs 1/4 of this section of the roadLet the total length be x, then 1/4*x = 3/4, so x=3

Hope it helps, (*.)

1.1 15 5·1 15 = 1 3 15 40 = 3 8 tons.

Kilogram. 3.Up to 1980 copies.

Set: The length of the road is x km.

3/4+3/4x=x

Answer: x=3 Answer: The road is 3 kilometers long.

One-fifteenth, one-third, eight-thirds, sixty-four, one hundred sixty-eight, c, three.

The loss is the difference between the cost and the list price, x = solution x is 1000The correct answer is 1000 yuan, and you can come up with it even if you don't list the equations.

333 (yuan).

A: The cost of this batch of goods is about 333 yuan.

Let the cost be x, then x - = 300

x - = 300

x = 300

x = 3333 and 1 3

Answer: The cost is 3333 and 1 3 yuan.

800 5 = 160 words 1800 160 = points and points.

200 10=20 words Xiao Ming should increase his speed to read 20 more words per minute.

800 5=160 words min 1800 10=180 words min Increase your reading speed by 20 words.

800 divided by 5 times 60 equals about 3 words per second, and the speech is finished in about 10 minutes.

Well, the equation is okay. Yes, if you can.

The distance between the two places is x kilometers

x*(1-1/4-20%)=22

x*x=40

A: A and B are 40 kilometers apart.

Learning progress!

Let A and B be separated by x kilometers. x-(x/4 + x/5)=22 (the result is calculated by yourself).

20%=1 5 , 1 4+1 5=9 20 ,1-9 20=11 20, 22 11 20=40km So A and B are 40km apart

8 8 sqm.

There are also square meters of area that have not been sprayed with water.

r=4，r=8

Failed to spray the area of water

s =π(r² -r²)/4

Cm.

This is a problem of subtracting two areas, subtracting the area of a 1 4 circle with a radius of 8 by the area of a 1 4 circle with a radius of 4. Quarters are r(8) squared - quarters are r(4) squared. The resulting area is the area that cannot be watered.

There is no sector area formula in the book? Subtract the small sector area from the large sector area 90 360 RR -90 360 RR. Answer for yourself...

Soccer 48 yuan is 2/5 The total amount of money is 48 divided by 2/5 is equal to 120 yuan, and volleyball is 3 x yuan.

Basketball plus volleyball is equal to 4x = 120-48 = 72 yuan.

x=18 yuan, that is, 18 yuan for volleyball.

Basketball is equal to 3*18=54 yuan.

Football 48 yuan, basketball 54 yuan, volleyball 18 yuan.

Total money = 48 (2 5) = 120;

Basketball and volleyball money = 120-48 = 72;

Money to buy volleyball = 72 * (5 (3 + 5)) = 45

Total money = 48 (2 5) = 120;

The total price of basketball and volleyball = 120-48 = 72

The price of volleyball = 72 5 8 = 45

1 (1 360 1 90 1 36) 24 persons.

There are 24 students in each of the primary, secondary and primary schools.

Assuming that each primary school student gets $x, the middle school student gets $4x each, and the college student gets $10x.

Therefore, the number of elementary school students, middle school students, and college students is (360x) (x+4x+10x)=24

Calculate the volume of the square iron block first:

9*9*9=729 (cubic centimeters).

Turn a cube of iron into a cuboid glass cylinder:

Hope it helps, (*.)

It's the puppy that's being copied.

I was the first to do it

(9 9 9) (25 12) = centimeters.

A: The water in the glass jar will drop by centimeters.

First find the volume of the cube of iron, the cubic of 9, and then divide it by the bottom area of the cuboid glass tank, and the result is the height of the water fall.

The volume of the cube v=9 9 9=729cm3

The bottom area of the glass cylinder is s=25 12=300cm2, so h=v s

The water in the glass jar fell by centimeters.

The volume of the iron that will drop when the water is taken out of the water is the volume of the iron block.

Therefore 9*9*9=25*12*h

h=300/927

This is obviously the fifth grade