A saxophone player practices 2 hours a day Sunday through Saturday of one week, then Sunday through Friday of a second week. How many hours would she need to practice on Saturday and Sunday combined in order to have practiced an average (arithmetic mean) of 3 hours a day over the two week period? Pick
A) 10 B) 12 C) 14 D) 16 E) 18
total number of hours practiced in the first week and through Friday of the second week: 7*2+5*2 = 14+10= 
<gadget id="calculator">14+10</gadget>
<output>24</output>
24   total number of hours needed to be practiced over the two weeks if the average daily practice is 3 hours:   14*3= 
<gadget id="calculator">  14*3</gadget>
<output>42</output>
42   thus there are 42 - 24= 
<gadget id="calculator">42 - 24</gadget>
<output>18</output>
18 hours still needed to be practiced on Saturday and Sunday of the second week   18
<result>E</result>
A saxophone player practices 2 hours a day Sunday through Saturday of one week, then Sunday through Friday of a second week. How many hours would she need to practice on Saturday and Sunday combined in order to have practiced an average (arithmetic mean) of 3 hours a day over the two week period?