The daily mean temperatures in January and July by selected cities are given in the following table.If the mean temperature in January is 1 degree higher in Tupelo than in Tucumcari,what do you estimate the difference (Tupelo-Tucumcari)in mean temperatures will be in July?
A) 1.25 degrees.
B) 2.0 degrees.
C) 0.40 degree.
D) 0.80 degree.
E) 1.0 degree.

Question

The daily mean temperatures in January and July by selected cities are given in the following table.If the mean temperature in January is 1 degree higher in Tupelo than in Tucumcari,what do you estimate the difference (Tupelo-Tucumcari)in mean temperatures will be in July? 
A) 1.25 degrees. 
B) 2.0 degrees. 
C) 0.40 degree. 
D) 0.80 degree. 
E) 1.0 degree.

Quizplus · Accepted Answer

Let the mean temperature in January in Tucumcari be x, then the mean temperature in January in Tupelo is x+1. 
In July, the temperature difference between Tupelo and Tucumcari will be the same as the temperature difference between July and January in each city. 
Therefore, the estimated difference in mean temperatures between Tupelo and Tucumcari in July is:
(85-43)-(59-25) = 42-34 = 8 
The estimated difference between Tupelo and Tucumcari in July is 8/8 = 1 degree.

The Daily Mean Temperatures in January and July by Selected