Urgent!!! Help me with two math problems, the sixth grade extension, which should be related to perc

There are two boxes of pears, the ratio of 30% of one box to 50% of the other box is 1:1, how many pears are at least in two boxes?

There are two boxes of pear AB, 25% of A is more than 50% of B is the same as B than A+B, please list any group of AB that meets the conditions.

A cup is filled with water, and now 40% of the water is poured out, and 40% of the water is added, what percentage of the water in the cup is the original at this time?

A project, a project team can be completed in 5 days, B engineering team can be completed in 8 days, how many days can the two engineering teams work together, how many days can complete the project 1 2??

The car factory produced a batch of car models according to the ratio of 1:24, the car model is long, what is his actual length? What is the length of the bus and the length of the model car?

Seven Incredible Events on Japanese Campuses: Evidence of Ghosts in the World (1) Scientists in the United States did an experiment, they found a person, hypnotized him, and he was able to tell his past life and what he looked like in this life (2) A friend of mine died so unfortunate She once used her own house ** to dial her own house ** out of boredom at home, and after many times finally dialed it, she heard a hollow sound, like an echo valley, and there was the sound of water droplets. She disappeared the next day, and three days later the police found my friend's body by a pool in Echo Valley. (3) Once, when I was returning home with my friend after dinner at twelve o'clock in the evening, I passed by a place where there was a grave, and my friend was very scared.

As a result, the next morning he was in high spirits, and often said these words: Someone has crawled out of the grave. They were laughing.

They were bleeding (4) There was a power outage in my house one night, and all I could find was a white candle, and I slept in the mirror after lighting the bed, but that day I felt tightness in my chest, I couldn't breathe, and I looked over and over as if I was being pressed by something, and when I looked in the mirror, I found that I was carrying my grandmother's bag! I obviously didn't carry it! The whole lake turned red (it was blood), and a hand was stretched out from the lake, and the girl's feet were grabbed, and she was pulled into the lake, and then, 100 kilometers away from the forest, the girl's body and clothes were found, but her head was missing, and the people opened her backpack and were frightened, and the bag was her head, and her expression was very painful, and the people who found her had abandoned her body in the forest, and then left, and since then, no one has dared to go to that forest.

If you read this post, please reply immediately, reply to "Bodhisattva bless", and then post this in three copies, if you don't send it, that hand will reach out when you take a bath, and you will end up the same as that girl! Be sure that everything is true. 5555 Because I'm afraid, so I send it

Bodhisattva bless.

1.A pile of coal, the first time it was transported a quarter of it, the second time another 140 tons were carried away, and the ratio of the tonnage of the remaining coal to the tonnage taken away was 2:3How many tons are there in this pile of coal?

400 tons. 2.Two same containers were filled with brine. The ratio of salt to water in the first container is 2:

3 The ratio of salt to water in the second vessel is 3:4Pour the brine from both containers into another large container.

So, what is the ratio of salt to water in a mixed solution?

Solve the original x test: 336*1 4+140=2:3*336

2:3 x =1/4x+140 。。

2/3x-1/4x =140

5/12x=140

x=140/(5/12)

x=140*(12/5)

x = 336 unsolution of saline x water y

2x+2y=3x+4yI still have to do my homework.

Centimeter = 540 km.

540 80 = small.

Answer: It takes hours to get from A to B.

2.1085 km = 108500000 cm 108500000 1 35000000 = cm Answer: This railway is centimeters long.

3.Centimeter.

135000000 1 30000000 = centimeters Answer: The distance between city A and city B is measured in centimeters.

4.10 1 3000000 = 30000000 cm = 300 km.

300 3 = 100 km.

100 (2+3) 2=40 km.

100-40 = 60 km.

A: The speed of car A is 40 km/h, and the speed of car B is 60 km/h.

6th grade proportional problem, solve (process)! Thank you!

1. On a map with a scale of 1:5000000, the distance between A and B is measured in centimeters, and Uncle Wang drives from A to B at a speed of 80 kilometers per hour, how many hours does it take?

Centimeter = 540 km.

540 80 = hours.

2. The total length of the Chengdu-Kunming Railway is 1085 kilometers. On a traffic map with a scale of 1:35000000, how many centimeters is this railway?

1085 km = 108500000 cm.

108500000 1 35000000 = centimeters.

3. On the map with a scale of 1:25000000, measure the distance between city A and city B by centimeters, if the scale is 1:30000000 on the map, measure the distance between city A and city B by centimeters?

Centimeter 4, on the map with a scale of 1:3000000, the two places are 10 cm apart, A and B two cars at the same time from the two places in the opposite direction, 3 hours later the two cars meet, it is known that the speed ratio of A and B is 2:3. What is the speed of car A and car B?

10 3000000 = 30000000 cm = 300 km.

A speed 300 3 2 (2+3).

40 kmh.

B speed 40 3 2 = 60 km h.

Language Interest Group: 52 10 (10+7+9)=20 (people) Mathematics Interest Group: 52 7 (10+7+9)=14 (people) English Interest Group: 52-20-14=18 (people).

2) Width: 8 3 4 = 6

High: 6 5 4=

Volume: 8-6

This question is to examine the volume formula of your cone.

If you break down this question step by step, it will be easy to understand.

First, calculate the volume of the cone: cubic centimeters.

Secondly, the conic volume formula is used: v= hr r 1 3, so the deformation is, h=v (r r) 1 3

So there is: h=

After removing the aluminum block. The surface of the container water dropped by centimeters.

Illustrate that the volume of the aluminum block is the same as the volume of the falling water.

That is, v= and the aluminum block is conical. The volume formula for a conical shape is v=1 3x is x r x r (r is the radius of the base) x h (h is the height of the cone).

So. h= squared) = 6

First, ( x is the volume of the conical lead block.

Secondly, 1 3 (which can be seen as a deformation of 1 3, where is to find the base area of the conical lead block, because the volume of the cone = 1 3 base area is high.

So the height of the cone = the volume of the cone 1 3 base area.

So 1 3, i.e. 1 3 (

Summing the two equations together gives x and calculates 6

Hope you understand.

The surface of the water of the container drops by centimeters, and the volume that falls is the volume of the cone. It is multiplied by the bottom area of the cuboid glass container by the centimeter (equivalent to the height).

x is to find the volume of the conical aluminum block, and to require its height, it has to be turned into the volume of a cylinder, so divide by 1 3 (equivalent to multiplying by 3), and then divide by (the square of one) the base area of the cone. Get the height of the cone.

Conical volume = base area * height * 1 3 This is the formula.

Then the conical volume is the volume of the water drained =

The volume of drained water should be the height of the water surface rising * the bottom area of the box) then height = the volume of drained water divided by the bottom area divided by one-third.

The first thing is to find the volume of the conical aluminum block, divide it by a third, because to find the volume of the cone, you have to multiply it by a third, except for the reduction, and then divide by the base area of the cone, which is its height.

Attached: The formula for calculating the volume of the cone: the base area multiplied by the height multiplied by one-third It should be clear to say so.

The formula for the volume of the box is v = base area times height, and the volume formula for the cone is v = base area times height divided by 3.

The height of the box - (the volume of the box - the volume of the cone) The base area of the box = , solve the equation and get the formula you wrote, I hope you can understand it. Where, the volume of the box - the volume of the cone = the volume of water.

The formula for calculating the volume of the cone is = 1 3 of the volume of the cylinder, so divide by 1 3

is the volume of the cone, and then according to the formula of the volume of the cone: 1 3 base area x height, divided by 1 3 is the base area of the cone x height, and then divided by the base area 1 2 (the area formula of the circle: the square of the radius), it is high.

is the volume of the cone, divided by 1 3 because the volume of the cone is 1 3 of the cylinder, and the square (I won't hit) is the bottom area of the cone (cylinder).

1 3 is the volume of the cone, find the formula, because the water surface is the volume of the falling, that is, the volume of the cone. Because the volume formula is v=1 3sh

1 3 is because of the shape of the container, and 1 3 is derived from the volume formula of the cone.