If the average (arithmetic mean) of 5 positive temperatures is x degrees Fahrenheit, then the sum C of the 3 greatest of these temperatures, in degrees Fahrenheit, could be	Choose the correct choice from the following.
A) 6x
B) C=4x
C) C=5x/3
D) C=3x/2
E) 3x/5
OA please. Yeah so 5x is the sum of the 5, then I guess 4x could be the answer (B)   But what about C,D,E? Any ideas why these could be wrong?   Note that we have 5 positive temperatures.   Next, as the average is x then the sum of the temperatures is 5x and as all the temperatures are positive then the sum of the 3 greatest must be more than (or equal to) 3x (as the average of the 3 greatest must be at least x) and less than 5x: 3x<sum<5x --=""> only option B fits.   Answer: C</sum<5x>=4x.
<result>B</result>
If the average (arithmetic mean) of 5 positive temperatures is x degrees Fahrenheit, then the sum C of the 3 greatest of these temperatures, in degrees Fahrenheit, could be