Final answer:
Caitlyn must work for 6 weeks in order to have more than enough money to buy the iPad.
Step-by-step explanation:
To find out how many weeks Caitlyn must work in order to have more than the amount of money to buy the iPad, we need to calculate the amount of money she still needs to save.
Caitlyn currently has $120 and needs a total of $450, so she still needs to save $330.
Caitlyn earns $55 per week, so we can divide the amount she needs to save ($330) by her earnings per week ($55) to find out how many weeks she needs to work.
= 330 ÷ 55 = 6
Caitlyn must work for at least 6 weeks in order to have more than enough money to buy the iPad.