The highest temperature ever recorded in Southlandia is -48 degrees Fahrenheit. The highest temperature ever recorded in Northlandia is 21 degrees Fahrenheit. The highest temperature recorded in Midlandia is -3 degrees Fahrenheit. What is the average highest temperature of these 3 countries?
-48 + 21 + (-3) = 
<gadget id="calculator">-48+21+(-3)</gadget>
<output>-30</output>
-30
-30/3 = 
<gadget id="calculator">-30/3</gadget>
<output>-10</output>
-10 degrees.
The average highest temperature recorded in Southlandia, Northlandia, and Midlandia is -10 degrees Fahrenheit.

<result>-10</result>