Every ten minutes during sunset, the sky changes to a new color. How many colors did the sky turn over the two hours of a long summer sunset if each hour is sixty minutes long?
At 60 minutes per hour, the sunset was 2 * 60 = 
<gadget id="calculator">2*60</gadget>
<output>120</output>
120 minutes long.
The sky changes color every 10 minutes, so it turned 120 / 10 = 
<gadget id="calculator">120/10</gadget>
<output>12</output>
12 colors over the summer sunset.

<result>12</result>