If the average (arithmetic mean) of 5 positive temperatures is x degrees Fahrenheit, then the sum V of the 3 greatest of these temperatures, in degrees Fahrenheit, could be Choose one.
A) 6x  B) V=4x  C) V=5x/3  D) 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 5positivetemperatures.   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: V</sum<5x>=4x.
<result>B</result>
If the average (arithmetic mean) of 5 positive temperatures is x degrees Fahrenheit, then the sum V of the 3 greatest of these temperatures, in degrees Fahrenheit, could be