<Tr> <Td> 1 long ton </Td> <Td> 20 long cwt or 2240 lb </Td> <Td> 7003101604690880000 ♠ 1016. 046 9088 kg </Td> </Tr> <Tr> <Th> Troy </Th> <Td> 1 grain (gr) </Td> <Td> ⁄ lb or ⁄ lb t </Td> <Td> 6995647989100000000 ♠ 64.798 91 mg </Td> </Tr> <Tr> <Td> 1 pennyweight (dwt) </Td> <Td> 24 gr or 7.776 carats </Td> <Td> 6997155517384000000 ♠ 1.555 173 84 g </Td> </Tr> <Tr> <Td> 1 troy ounce (oz t) </Td> <Td> 20 dwt </Td> <Td> 6998311034768000000 ♠ 31.103 4768 g </Td> </Tr>

Which of the following units are most commonly used in the united states check all that apply