Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Mary tried to improve her health by changing her diet, but her weight bounced like a yo-yo.  At first, she dropped a dozen pounds. Then, she added back twice the weight that she initially lost.  Then, she dropped three times more weight than she initially had lost.  But finally, she gained back half of a dozen pounds.  If she weighed 99 pounds at the start of her change in diet, what was her final weight, in pounds?

### Response:
 Tangu Mary awe na uzito wa pauni 99 mwanzoni, baada ya kupunguza uzito wa dazeni alikuwa na uzito wa 99-12=<<99-12=87>>87 pauni.
Uzito mara mbili wa uzito aliopoteza awali ni pauni 12*2=<<12*2=24>>24.
Hivyo, alipoongeza mara mbili uzito aliopoteza awali, uzito wake ulipanda hadi 87+24=<<87+24=111>>111 pauni.
Uzito mara tatu zaidi ya uzito aliopoteza awali ni pauni 12*3=<<12*3=36>>36.
Hivyo, alipoteza uzito hadi 111-36=<<111-36=75>>75 pauni.
Mwishowe, aliongeza nusu ya dazeni ya uzito aliopoteza, uzito wake wa mwisho ulikuwa ni pauni 75+6=<<75+6=81>>81.