300 pounds = 136.1 kilograms, approx.
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Specific gravity of gold = 19.3 (so density = 19.3 grammes per cubic centimetre) Volume of gold block = 20*15*10 = 3000 cubic centimetre Mass of gold block = 3000*19.3 = 57900 grammes = 57.9 kilogrammes.
Kilograms +++ That is the correct metric unit of mass to use, but you would not normally mix unit systems like that. You'd either convert the gallon to litres, or stick to Imperial for both. ' So a gallon of milk (US or UK gallon) weighs a certain number of pounds; a litre of milk weighs a certain number of kilogrammes.
how much per ounce?
much much much greater
Much can be an adjective or adverb, and more rarely a noun. There isn't much time. (adjective) These seeds are much smaller. (adverb) He didn't eat much. (noun)