If the Average (mean ) of 13 positive temperatures is x degrees fahrenheit, then the sum of the 3 greatest of these temperatures, in degrees Fahrenheit, could be
Pick
A) 6x
B) 12x
C) 5x/3
D) 3x/2
E) 3x/5
Let the 5 numbers be 1,2,3,4,5, ...,13 (since no restrictions are given). There mean is 7 (x).   Now the sum of greatest three would be 11+12+13= 
<gadget id="calculator">11+12+13</gadget>
<output>36</output>
36   so the answer has to be 12x....that is option 12x
<result>B</result>
If the Average (mean ) of 13 positive temperatures is x degrees fahrenheit, then the sum of the 3 greatest of these temperatures, in degrees Fahrenheit, could be