There are three kinds of flowers in the garden: Rose, rose and jasmine. It is known that the number of rose and rose is 2:3, and the mathematical ratio of rose and jasmine is 5:4 If we reduce the number of jasmine by 20, there will be as many as roses. How many roses are there?

In fact, the problem here is how to unify the two ratios. The core is the rose. In the former ratio, it is 3; in the latter ratio, it is 5. Here we need to use the basic definition of a ratio: the former and the latter expand or shrink at the same time, and the same multiple ratio remains unchanged

A piece of land is 3 / 4 hectare. There are 1 / 4 kinds of roses, 2 / 5 kinds of tulips and the rest kinds of rhododendrons. How many parts of the total area are rhododendrons

1/10

The florist transported 280 roses, and the tulips transported back were 1 / 7 more than the roses, and the roses were 2 / 5 more than the lilies?
Not roses, lilies

I'm a primary school student. Did you scold me for miscalculation~~~
Tulip = 320
Lily = 168

What is the formula for calculating the thrust and pull of the cylinder?
(Note: we all know that under the same cylinder diameter, the cylinder force is large, but it needs to be proved by formula, not by mouth.)
For example, the thrust of the oil cylinder f = P * s, P = system working pressure, s = cross-sectional area of the oil cylinder

The thrust of the cylinder f = P * s, P = system working pressure, s = cross-sectional area of the cylinder
Under the same cylinder diameter, the cylinder force is large, mainly because the oil pressure of the hydraulic system is much higher than the air pressure. The pressure of compressed air is generally 5 ~ 8 kg / cm2 in industry, while the oil pressure provided by the hydraulic oil pump can be as high as dozens or even hundreds of kg / cm2

How to calculate the air consumption of cylinder?
It is known that the cylinder diameter is 100 mm. With a fixed pressure of 0.8 MPa, the cylinder stroke is 75 mm, and it works 100 times per minute and 200 times back and forth. Please give a detailed formula,

1. Air consumption: the amount of air consumed in the cylinder and the piping between the cylinder and the reversing valve when the cylinder reciprocates for one stroke (under the state of standard atmospheric pressure). 2. Maximum air consumption rate: the amount of air consumed per unit time (under the state of standard atmospheric pressure) when the cylinder piston moves at the maximum speed

Calculate the air consumption value of cylinder
The common action time of single tightening and releasing is 4S, and the maximum working pressure is 0.7MPa, and the air consumption per minute is L / min

1. Air consumption: the amount of air consumed in the cylinder and the piping between the cylinder and the directional valve when the cylinder reciprocates for one stroke (under standard atmospheric pressure)
2. Maximum gas consumption rate: the amount of air consumed per unit time when the cylinder piston moves at the maximum speed (under standard atmospheric pressure)
Maximum air consumption of cylinder: q = piston area X piston speed x absolute pressure
The usual formula is: q = 0.046d & # 178; V (P + 0.1)
Q --- maximum air consumption of cylinder under standard condition (L / min)
D ----- cylinder diameter (CM)
V ------ maximum speed of cylinder (mm / s)
P ----- service pressure (MPA)

How to calculate the air consumption of cylinder
6 bar air pressure, 100 mm cylinder diameter, how to calculate the air consumption in one minute?

The working volume of the cylinder is the volume swept by the piston. How to calculate the air consumption in one minute? If it is at idle speed (800 RPM), the air intake is once every two revolutions (four strokes), it is 800 / 2 * exhaust volume. This is the theoretical value. In fact, the valve is closed at idle speed (only with idle hole intake). For a 1.8L engine, the air intake at idle speed is about 3.6g/s

What is the air consumption of 80 * 200 cylinder

Simple can calculate the volume of the cylinder, and the reciprocating frequency is multiplied by the air consumption per unit time, the volume of the cylinder can be calculated according to the cylinder diameter and stroke

Why division is used to convert cloth yards into meters

Because 1 yard = 0.9144 meters
If it's yards, it should be multiplied by 0.9144
Because 1 meter = 1.0936 yards
If you use this coefficient to convert the number of yards into meters, you need to divide. Generally, you use the above coefficient. The conversion of yards into meters is multiplication, not division

How to calculate the amount of fabric needed for a garment?
How to calculate how much cloth to use to make a dress?

First of all, you have to find one who can print (it's best if you can). Give her the clothes and ask him to help print. After the print comes out, you can basically calculate the amount of a piece of clothes. (fabric, lining and cotton can be calculated, so the cost will come out naturally)
The size of the amount of typesetting master is also very important, to see whether he saves or costs

There are three kinds of flowers in the garden: Rose, rose and jasmine. It is known that the number of rose and rose is 2:3, and the mathematical ratio of rose and jasmine is 5:4 If we reduce the number of jasmine by 20, there will be as many as roses. How many roses are there?