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?
Vanessa needs $80 - $20 = $
<gadget id="calculator">80-20</gadget>
<output>60</output>
60 to buy the dress.
She manages to gather $30 - $10 = $
<gadget id="calculator">30-10</gadget>
<output>20</output>
20 each week.
The number of weeks she has to wait is 60 / 20 = 
<gadget id="calculator">60/20</gadget>
<output>3</output>
3 weeks.

<result>3</result>