Tom decides to renovate a house.  There are 3 bedrooms and each bedroom takes 4 hours to renovate.  The kitchen takes 50% longer than each bedroom.  The living room took twice as much time as everything else combined.  How long did everything take?
The kitchen took 4 * .5 = 
<gadget id="calculator">4*.5</gadget>
<output>2</output>
2 hours longer than the bedrooms.
So the kitchen took 4 + 2 = 
<gadget id="calculator">4+2</gadget>
<output>6</output>
6 hours.
The bedrooms took 3 * 4 = 
<gadget id="calculator">3*4</gadget>
<output>12</output>
12 hours.
So the kitchen and bedrooms combined took 12 + 6 = 
<gadget id="calculator">12+6</gadget>
<output>18</output>
18 hours.
The living room took 18 * 2 = 
<gadget id="calculator">18*2</gadget>
<output>36</output>
36 hours.
So everything took a total of 18 + 36 = 
<gadget id="calculator">18+36</gadget>
<output>54</output>
54 hours.

<result>54</result>