The fall semester lasts 15 weeks.  During the weekdays, Paris studies 3 hours a day for her classes.  On the weekends, she spends 4 hours studying on Saturday and 5 hours studying on Sunday.  How much time does Paris study during the semester?
During the weekdays, Paris studies 3 hours a day for 5*3 = 
<gadget id="calculator">3*5</gadget>
<output>15</output>
15 hours.
She studies 4 hours on Saturday and 5 hours on Sunday for a total of 4+5 = 
<gadget id="calculator">4+5</gadget>
<output>9</output>
9 hours on the weekends.
If she studies 15 hours during the weekdays and 9 hours on the weekends then she studies 15+9 = 
<gadget id="calculator">15+9</gadget>
<output>24</output>
24 hours per week.
There are 15 weeks in the fall semester and she studies 24 hours a week so she will spend 15*24 = 
<gadget id="calculator">15*24</gadget>
<output>360</output>
360 hours studying.

<result>360</result>