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