A pound (Lb) is a unit of measurement for weight while a yard is a unit of measurement for distance. I think you have your question mixed up!
If you need to make any conversions, I suggest the following site
http://www.onlineconversion.com/ If you are refering to common measurements used on a construction site, a "yard" is a common abbreviation for a "cubic yard", which is a unit of measurement of volume. (A cubic yard equals 27 cubic feet.) In common usage, you may be asking what does a "cubic yard" of something like dirt or concrete weigh? Since dirt weighs about 110 pounds per cubic feet, a cubic yard of dirt weighs about 2970 Lbs. Since concrete is heavier (150 pcf), a cubic yard of concrete weighs about 4050 Lbs.
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Wet concrete is approximately 150 pounds per cubic foot. So 80 pounds is approximately 1/50 th of a cubic yard.
4 pounds of sand, and 2 pounds of cement for each yard of stucco.
One yard of PEA Gravel weighs approximately 3,000 pounds Clarification: one CUBIC yard weighs approx 3,000 pounds.
According to the related link below; the required amount to cover 1 square yard with 4 inches of concrete is 6.6 60 pounds bags.
Each 60 pounds bag of ready mix concrete will make .45 cubic foot of concrete. There are 27 cubic feet in a cubic yard. You will need 60 bags of 60 pound premixed concrete to make 1 cubic yard.