Interior is inside. Exterior is the outside.
When solving a word problem, it is always important to make sure you actually understand what's going on. It helps to spend some time making sure you assign the proper variables to each part of the problem before attempting to solve it.
When you decrease 20 to 11,the decrease is 9
the percentage decrease is
(9/20)*100
=9*100/20
=9*5
=45%
The mean is 7.5
It is the average of the two values.
The answer is C your welcome Gn
