Answer:
A measure of <em>Center</em><em> </em>summarizes all of the values in a data set with a single number.
i.e., median, mode, mean...
It is not.
6/12≠1/12
Say you where having a party and brought 2 one dozen boxes of cupcakes. After the party was over, you look in the first box and find 6 of the twelve cupcakes left. You look in the second box and find 1 of the twelve cupcakes left. The number of cupcakes left in each box isn't the same. The two fractions aren't equivalent.

Length of the room is 5 m and width is 5 + 2 = 7 m.
Hope this helps.
r3t40