If the Average (mean ) of 9 positive temperatures is x degrees fahrenheit, then the sum of the 3 greatest of these temperatures, in degrees Fahrenheit, could be
Choose the most appropriate option.
A) 8x B) 4x C) 5x/3 D) 3x/2 E) 3x/5
Let the 5 numbers be 1,2,3,4,5,..9 (since no restrictions are given). There mean is 4 (x).   Now the sum of greatest three would be 7+8+9= 
<gadget id="calculator">7+8+9</gadget>
<output>24</output>
24   so the answer has to be 8x....that is option 8x
<result>A</result>
If the Average (mean ) of 9 positive temperatures is x degrees fahrenheit, then the sum of the 3 greatest of these temperatures, in degrees Fahrenheit, could be