According to this ratio, C25 concrete mix proportion (weight ratio): cement: Sand: Gravel: water = 1:1.48:3.63:0.44; cement 420 yuan per ton, sand 105 yuan per cubic meter, stone 75 yuan per cubic meter, water 1.5 yuan per cubic meter; how much does it cost to find a cubic meter of sand and stone?

According to this ratio, C25 concrete mix proportion (weight ratio): cement: Sand: Gravel: water = 1:1.48:3.63:0.44; cement 420 yuan per ton, sand 105 yuan per cubic meter, stone 75 yuan per cubic meter, water 1.5 yuan per cubic meter; how much does it cost to find a cubic meter of sand and stone?

Your question is very simple. If the cement ratio is 1, we can locate 420 kg of ordinary portland cement with grade 32.5. Then the sand, stone and water are 621.6 kg, 1524.6 kg and 184.8 kg. Cement is 0.42t × 420 = 176.4 yuan. If one cubic meter of sand is 1500 kg, then 621.6 kg △ 1500 cm

The density of oxygen in an iron and steel cylinder is 8 kg / m3. If three-quarters of the oxygen is used in one gas welding, the remaining oxygen density in the cylinder is?
I didn't listen to class. Please, I have to hand it in tomorrow

After the steel bottle is used, it is the same as before, so the volume of gas does not change
Use 3 / 4 of them, so the quality is 3 / 4 of the original
From: density = mass / volume
Density = 1 / 4x mass / volume = 1 / 4 density = 1 / 4x8kg / M & sup3; = 2kg / M & sup3;

What is the material with a density of 2700 kg / m3?

The material with a density of 2700 kg / m3 is metallic aluminum