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"The density is 3,000 kg per cubic meter." That tells you that every cubic meter of it has 3,000 kg of mass.There are 6 cubic meters in 6 cubic meters.Each cubic meter has 3,000 kg of mass.So in 6 cubic meters, there are (6 x 3,000) = 18,000 kgof mass
Approx 2710 kg per cubic metre.
A kg is a measure of mass, a cubic meter is a measure of volume, so without a way to convert from one to the other (in this case a mass density), the question has no meaning. If you were considering something with a density of about 1 gram per cm, like water, then the answer would be 1000 kg (a metric tonne), but if the substance were 5 grams per cm, like rock, then the answer would be 5000 kg
Grams are a measure of weight, a square meter is a measure of area, and a cubic meter is a measure of volume. These are not comparable.
Cement content varies on concrete type, but is typically 400kg per cubic metre. According to the manufacturer, Portland Cement (which is what 99.9% of all cement actually is) has a density of 1505kg/cubic meter.