1: What is the mix proportion of cement mortar of 3? How to calculate the mix proportion of mortar

1: What is the mix proportion of cement mortar of 3? How to calculate the mix proportion of mortar

Cement: Sand: water = 1:3:0.5

Is mortar mix proportion volume ratio or mass ratio

&A: the mortar mix proportion is the mass ratio (because the same one is used in code for design of masonry mortar mix proportion (JGJ / t98-2010) and technical code for plastering mortar (JGJ / t220-2010), the mortar trial strength (402; m, 0, So you don't have the title of "masonry" and "plastering" and answer like this: the mortar mix proportion is the mass ratio). & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; now extract the partial content of "code for design of masonry mortar mix proportion" JGJ / t98-2010: to confirm, see the & nbsp; & nbsp; 1 in the first paragraph of article 5.1.1 to calculate the mortar trial strength (# 402; m, 0) 2) calculate the amount of cement (QC) per cubic meter of mortar; 3) calculate the amount of lime paste (QD) per cubic meter of mortar; 4) determine the amount of sand (QS) per cubic meter of mortar; 4) determine the amount of lime paste (QD) per cubic meter of mortar; 5) Select the water consumption per cubic meter of mortar (QW) according to the consistency of mortar. & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; and then look at the unit of (QC), (QD), (QS) and (QW)! The unit is (kg)! This proves that the mix proportion of masonry mortar is the mass ratio. & nbsp; 8205; (Note: QA is the total amount of QC and QD) & nbsp;

The average number of a, B and C is 70, a: B = 2:3, B: C = 3:5, B is ()

It can be seen that a: B: C = 2:3:5, let a, (2a + 3A + 5a) / 3 = 70, a = 21, B = 3A = 21 * 3 = 63

The product of all real numbers whose absolute value is less than 3 is () a 6 B 12 C 0 d - 6

Because the absolute value of 0 = 0,0

What is 75 percent minus 3 percent

9 out of 28

When Xiao Ming solves the equation 2 / 5x-a = 1 / 10-1 / 2x about X again, he does not multiply - A on the left by 10 when he goes to the denominator to get x = 2
(1) Try to find the value of A
(2) find out the solution of the original equation

Take x = 2 and get 4 * 2-A = 1-5 * 2
So a = 17
The original equation becomes 4 * X-10 * 17 = 1-5 * X
So x = 19

Party A and Party B process the same parts. Party A processes 20 parts in 15 minutes and Party B processes 25 parts in 20 minutes. Whose efficiency is higher
Do with

The work efficiency ratio of a and B is:
20/15:25/20=16:15
So the efficiency of a is higher!

1/2x²-3x+4=-1/2

1/2x²-3x+4=-1/2
Shift 1 / 2x & # 178; - 3x + 9 / 2 = 0
Multiply both sides by 2 x & # 178; - 6x + 9 = 0
Formula (x-3) ² = 0
So x = 3
I'm very happy to answer your questions, and yanghailing will answer your questions
If there is anything you don't understand, you can ask. The top right corner of the mobile client is satisfied

Each warehouse has several tons of grain, which is transported from warehouse A to warehouse B and then from warehouse B to warehouse a
How much of the grain in warehouse A is that in warehouse B?

The conditions you give are not complete and cannot be calculated. If there is a condition that the quantity of grain in the two warehouses after transportation is the same, then there is an answer
After transportation, a: B = 1:1
Before the second delivery, a: B = 0.5:2
So before the first use, it is a: B = 0.75:1.25 = 3:5
So the answer is 3 / 5
If the condition is not as I expected, as long as the calculation method is similar to mine, the correct result will be obtained

Solution equation: 0.3 * 7 + 4x = 12.5

0.3*7+4x=12.5；
4x=12.5-2.1；
4x=10.4；
x=2.6；