Answer :
Start with
[tex]12h+240>360[/tex]
Subtract 240 from both sides:
[tex]12h>120[/tex]
Divide both sides by 12:
[tex]h>10[/tex]
So, she needs to work at least 10 hours. Note that this is the minimum number of hours Ellie needs to work this week to earn at least $360 by the end of the month. This problem has no maximum: the more she works, the more she gains, so there's likely a typo in the question.