If you're a junior or senior, you've seen versions of this problem before, perhaps on the SAT (the source of this problem). As I've said before, the SAT is designed in a way that calculators are not necessary and each question must be solvable in less than a minute. Often, the student is expected to change the form of the question: text to algebra, or algebra to visual (graphical); or rearrange the terms, or work backwards from the known.
As it stands, that question would take you far too long to find an answer for, so it must have a simplification somewhere.
What can we do to make this quicker to answer?
Or simpler to understand?
How can we change it?