How to calculate the dosage of cement and sand when the thickness of 1:3 cement mortar plastering is 20 mm? How many kg per square and cubic? What formula

How to calculate the dosage of cement and sand when the thickness of 1:3 cement mortar plastering is 20 mm? How many kg per square and cubic? What formula

It can be calculated according to the latest norm of the province, and the mix proportion of plastering mortar is behind the norm

How many bricks, how many kilograms of sand and cement are needed to build 12 walls per square meter? If you need to use a thin mortar, how much cement mortar is needed?

It needs 64 standard bricks, 30kg sand, 3kg cement and 6kg gypsum per square meter to build 12 walls. If the cement mortar is 1cm thick on both sides, 30kg sand and 10kg cement are needed
This is calculated according to the actual work of workers. If you need official data, please refer to the budget quota of each province

Cement mortar leveling layer?
What is the meaning of every 5mm increase or decrease in the thickness of cement mortar leveling layer?

Cement mortar leveling layer, every 5mm increase or decrease in thickness
For example: there is the quota subitem of 15mm thick cement mortar leveling in the quota, and your design leveling thickness is 10mm, then you need to set the cement mortar leveling layer, and then set the amount of "cement mortar leveling layer, every 5mm increase or decrease in thickness" as - 1, if your actual thickness is 25mm, then the amount is 2

As shown in the figure, when the aircraft flies, the direction of the aircraft is expressed by the tutor size between the flight route and the actual South or north direction line. The clockwise angle between an (north-south line) and the flight line is used as the flight azimuth. The flight azimuth from a to B is 40 degrees, the flight azimuth from a to C is 75 degrees, and the flight azimuth from a to D is 150 degrees,
1. How many degrees is the angle between AB and AC?
2. What is the angle between AD and AC?
3. Draw the flight line of 115 ° from a

The angle between AB and AC is 60-35 = 25 degrees
The angle between AD and AC is 145-60 = 85 degrees
Draw ∠ NAE = 105 ° with protractor, then AE is the flight line to be drawn

Given that 2x-3y-z = 0, x + 3y-14z = 0, and X, y, Z are not all 0, find the square of 4x - 5xy + Z / XY + YZ + ZX
yes
4X squared - 5xy + Z squared
——————————
xy+yz+zx
Hurry, hurry
fast

From 2x-3y-z = 0, x + 3y-14z = 0, and X, y, Z are not all 0
The solution is x = 5Z, y = 3Z
Take x = 5Z, y = 3Z into the square of 4x-5xy + Z / XY + YZ + ZX
have to
4 * 25Z square - 5 * 5Z * 3Z + Z square / 5Z * 3Z + 3Z * Z + Z * 5Z = 26 / 23

It can be transported by car a alone in 4 hours, and by car B alone in 6 hours. Now it takes 5 / 6 of the goods to be transported by car a and car B together. How long does it take?

2 hours 30 minutes

5x-5-3+3y+7-7y=12-27+3x
5y-5-3 + 3Y + 7-7y = 100

5y-5-3+3y+7-7y=y-1=100
y=101

A transport team transported a batch of flour, three seventh of which were transported in the first time, and the remaining two seventh in the second time, with a total of 54 tons transported in two times
How many tons of flour are there in this batch

54÷【3/7+（1-3/7）×2/7】
=54÷【3/7+8/49】
=54÷29/49
=2646 / 29 tons
The number is wrong

When m is a value, the function y = (m-2) x ^ 2 + 3x-5 (M is a constant) is a quadratic function of X
What is m

For quadratic function, m-2 ≠ 0
So m ≠ 2

There are 60 male workers in a workshop, which is one third of that of female workers. How many female workers are there?

Female workers = 60 △ 1 / 3 = 180