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

### Instruction:
 Vanessa anataka kununua gauni aliloliona kwenye duka, ambalo linagharimu $80, na tayari ana $20 akiba. Wazazi wake humpea $30 kila wiki, lakini pia anatumia $10 kila mwisho wa wiki katika michezo ya video. Atalazimika kusubiri kwa wiki ngapi hadi aweze kukusanya pesa za kutosha kununua gauni?


### Response:
 Jumla ya pesa ambazo Vanessa anahitaji ni $80 - $20 = $<<80-20=60>>60.
Kiasi cha pesa anachoweza kukusanya kila wiki ni $30 - $10 = $<<30-10=20>>20.
Hivyo atalazimika kusubiri kwa $60 ÷ $20 = 3 wiki.