The Official Guide For GMAT® Quantitative Review, 2ND EditionAttachment:

Untitled.png

In triangle ABC above, what is x in terms of z ?

(A) z + 73

(B) z -73

(C) 70 - z

(B) z - 70

(E) 73 - z

Problem Solving

Question: 44

Category: Geometry Angle measure in degrees

Page: 67

Difficulty: 600

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It's best to work until you find a supplementary relationship between the two. The unlabeled angle in the triangle with x = 180 - 37 - x or 143 -x. Meanwhile, the supplementary angle for the "z" triangle is 180 - z - 70 = 110-z

110-z + 143 - x = 180 because they are on the same line.