 
 <translate> Since Mary first weighed 99 pounds, after she dropped a dozen pounds she weighed 99 - 12 = 87 pounds. Twice the weight she initially lost is 12 * 2 = 24 pounds. So, when she added back twice the weight that she initially lost, her weight jumped to 87 + 24 = 111 pounds. Three times more than she initially had lost is 12 * 3 = 36 pounds. Therefore, when Mary lost 3 times more than she initially lost, her weight dropped to 111 - 36 = 75 pounds. Finally, when Mary gained back half of a dozen pounds, her final weight was 75 + 6 = 81 pounds.
Thus, the answer is 81. <ibo> Ebe ọ bụ na Meri buru ụzọ tụọ kilogram iri itoolu na itoolu, mgbe ọ tụfuru kilogram iri na abụọ, ọ dị kilogram iri itoolu na itoolu - 12 = kilogram iri asatọ na asaa. Ugboro abụọ nke ibu o bu ụzọ felata bụ kilogram 12 * 2 = 24. Ya mere, mgbe ọ gbakwụnyere okpukpu abụọ nke ibu ahụ ọ tụfuru ná mmalite, ịdị arọ ya rịrị elu ruo kilogram 87 + 24 = 111. Ugboro atọ nke ihe ọ tụfuru ná mmalite bụ 12 * 3 = 36 pound. N'ihi ya, mgbe Mary tụfuru ihe ji okpukpu atọ karịa ihe ọ tụfuru na mbụ, ọ bịara dịzi naanị kilogram iri na otu na iri atọ na isii. N'ikpeazụ, mgbe Mary tụtụkwuru kilogram iri na ise, ọ bịara dị kilogram iri asaa na ise tinyere isii, ya abụrụ kilogram iri asatọ na otu. N'ihi ya, azịza ya bụ 81. 