In the figure shown, what is the value of v+x+y+z+w?

Although GMAT pictures may be not completely accurate and drawn to scale, I realize they don't usually try to "trick" users... Therefore I just drew the figure on a piece of paper and given the answer choices I realized the sum of the angles must be somewhere around 180 degrees:


Probably this approach is not the most scientific and reliable way to solve the problem, but I guess it worked on this one.