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GRE Quantitative Practice, Quantitative Comparison

Question 4

transversal

l1  ||   l2
Quantity A

w + y

Quantity B

w + z

  1. Quantity A is greater.
  2. Quantity B is greater.
  3. The two quantities are equal.
  4. The relationship cannot be determined from the information given.

Explanatory Answer

You can cancel the term w from both quantities, leaving the comparison between y and z. Since the two lines are parallel, corresponding angles formed by the transversal are congruent (equal in degree measure, or size). Accordingly, y = z, and the two quantities are equal. The correct response is (C).