Answer:
20. x = 23; 21. y = 23
Step-by-step explanation:
20. The 2 highlighted angles are congruent, meaning the angles are equal to each other;
91 = 5x-24 (add 24 to both sides)
115 = 5x (divide both sides by 5)
x = 23
21. Opposite side exterior angles are congruent, set them equal to each other:
115 = 5y (divide both sides by 5)
y = 23
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