Answer: City A, 
Step-by-step explanation:
Given
The temperature of city A is 
The temperature of city B is 
We know, 
So, 

Clearly, the average temperature of city A is more than city B
The difference in temperature is 
What do you need help with? :0
Since she shared 1/3of brownies with 6 friends it would be 6/ 1/3= 6/1 •1/3 so each friend got 6/3 of the pan