This reminds me of the riddle: “Which weighs more an ounce of gold or an ounce of silver?” Answer: An ounce of gold because it uses the Troy ounce.
But which weighs more, a pound of gold or a pound of silver? 
This reminds me of the riddle: “Which weighs more an ounce of gold or an ounce of silver?” Answer: An ounce of gold because it uses the Troy ounce.
But which weighs more, a pound of gold or a pound of silver?