The answer depends on the material and quality of the carpet.
how much does 30 square meters of carpet weigh?
You cannot weigh an area. Just as you cannot weigh a distance. (How much does one centimeter weigh?)
You cannot weigh an area, but you can weigh a volume... so, one cubic meter of stainless steel weighs 7480 - 8000 kg. See related link for the source.
a meter has 100 centimeters, so a square meter has 100x100 square centimeters, which is 10 000 square centimeters
Carpets are sold per square meter (unless you find an off cut the size required). Your longest length is 7m, so your carpet will be 7sqm @ £20 per sqm = 7 x £20 = £140. Would exclude gripper rod, underlay and fitting though!
how much of square meter equal one aker
It depends on the carpet.
8.325 a sq meter.
0, because a lineal meter has an area of 0
About $450.00
You cannot weigh an area. Just as you cannot weigh a distance. (How much does one centimeter weigh?)
This largely depends on the material the carpet is made out of. Other factors that contribute to weight are how thick the carpet it is, and how dense the carpet fibers are.
560 kilograms
depend on the stone used for the gravel.
133.33 square yards of carpet
120 dollars
Density of loose soil is about 1200 kg/m3 1 cubic meter of soil may weigh more than this if compacted or moist.
a square meter is 1.195 sq yards 26.00/1.195 = 21.75 per sq yard