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Temperature average problem

Expert replies
by madsport » Mon Sep 15, 2008 9:39 am
If the average (arithmetic mean) of 5 positive temperatures is x degrees Fahrenheit, then the sum of the 3 greatest of these temperatures, in degrees Fahrenheit, could be

(A) 6x
(B) 4x
(C) 5x/3
(D) 3x/2
(E) 3x/5

The answer is B

How do you solve this problem?
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Source: — Problem Solving |

Re: Temperature average problem

by Sunny22uk » Mon Sep 15, 2008 9:55 am
madsport wrote:If the average (arithmetic mean) of 5 positive temperatures is x degrees Fahrenheit, then the sum of the 3 greatest of these temperatures, in degrees Fahrenheit, could be

(A) 6x
(B) 4x
(C) 5x/3
(D) 3x/2
(E) 3x/5

The answer is B

How do you solve this problem?
Average=sum/total numbers
sum=5x
Sum of 3 greatest of these temperatures<5x
4x is the greatest option among B, C, D ,E
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by alescau » Mon Sep 15, 2008 10:44 am
3 largest ones added together should be more than 3x.
(A) 5x=6x+?? Wrong
(B) 5x=4x+?? We can solve this.
Ans.B
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