Marcy spends 12 minutes petting her cat and 1/3 of that time combing it. How many minutes does she spend with her cat in total?
First find the time Marcy spends combing the cat: 12 minutes / 3 = 
<gadget id="calculator">12/3</gadget>
<output>4</output>
4 minutes.
Then add that to the time spent petting the cat to find the total time she spends with it: 4 minutes + 12 minutes = 
<gadget id="calculator">4+12</gadget>
<output>16</output>
16 minutes.

<result>16</result>