GMAT question - What is x + y equal to? - Review

Type: Problem Solving

Difficulty: 3 star rating

Triangle with exterior angles x, y and 80

What is x + y equal to?

  1. 80
  2. 100
  3. 200
  4. 280
  5. 300

Explanation

We know that the angle of a straight line is 180° so we can fill in the interior angles in the triangle.

Triangle with external angles x, y and 80

And we know that the interior angles of a triangle add up to 180°, so

mathematical expression

Simplifying this gives us

mathematical expression

Therefore

mathematical expression

Which means the answer is D.

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