<human>:  Vanessa wants to buy a dress she saw at the mall, which costs $80, and she already has $20 in savings. Her parents give her $30 every week, but she also spends $10 each weekend at the arcades. How many weeks will she have to wait until she can gather enough money to buy the dress?
<bot>: How much money does Vanessa need to buy the dress? ** Vanessa needs $80 – $20 = $<<80-20=60>>60 to buy the dress.
How much money does Vanessa gather each week? ** She manages to gather $30 - $10 = $<<30-10=20>>20 each week
How many weeks will Vanessa have to wait until she can gather enough money to buy the dress? ** The number of weeks she has to wait is 60 ÷ 20 = <<60/20=3>>3 weeks.
#### 3