On Mondays, Wednesdays, and Fridays, college student Kimo has three 1-hour  classes each day.  On Tuesdays and Thursdays, he has two 2-hour classes each day.  In one semester, there are 16 weeks of school.  In one semester, how many hours does Kimo spend attending classes?
Kimo spends 3 x 1 = 
<gadget id="calculator">3*1</gadget>
<output>3</output>
3 hours in class on any given Monday, Wednesday or Friday.
Each week, he spends 3 x 3 = 
<gadget id="calculator">3*3</gadget>
<output>9</output>
9 hours in class on Monday, Wednesday, and Friday.
In one semester, he spends 9 x 16 = 
<gadget id="calculator">9*16</gadget>
<output>144</output>
144 hours in class for Monday, Wednesday, and Friday.
He spends 2 x 2 = 
<gadget id="calculator">2*2</gadget>
<output>4</output>
4 hours in class on any given Tuesday or Thursday.
Each week, he spends 4 x 2 = 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 hours in class on Tuesday and Thursday.
In one semester, he spends 8 x 16 = 
<gadget id="calculator">8*16</gadget>
<output>128</output>
128 hours in class on Tuesday and Thursday.
In total for one semester, Kimo spends 144 + 128 = 
<gadget id="calculator">144+128</gadget>
<output>272</output>
272 hours attending classes.

<result>272</result>