Question 1072460

Let the Universal set, S, have 169 elements. A and B are subsets of S. Set A has 80 elements, and set B has 75. If the total number of elements in A or B is 132, how many elements are in A, but not in B?

I have made a Venn Diagram, with 80 in A, and 75 in B. I am unsure how to figure out the problem from there. I have been working on it for over an hour now. 

Thank you.
<pre>The 80 you have in A includes 57 in just A, but 23 in both A & B.
Therefore, elements in A, but not in B, or elements in just A, alone = {{{highlight_green(57)}}}