GMAT Official Guide 2019 In the figure shown
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Since angles on a line must add to 180°, we can see that there are three 30° angles in our diagram...
Next, let's focus on the BLUE triangle.
Since angles in a triangle must add to 180° (and since we already have two angles measuring 30° each), the third angle must be 120°
Next, we have two angles sharing the same GREEN line.
Since angles on a line must add to 180°, we can see that the other angle must be 60°
Finally, we can focus on the RED triangle.
Since angles in a triangle must add to 180° (and since we already have two angles measuring 30° and 60°), the third angle (x) must be 90°
Answer: D
Cheers,
Brent