Geometrymedium · Past Paper
Two parallel lines are cut by a transversal. If one co-interior angle is (3x + 20) and the other is (2x + 10), find x.
A15
B30
C50
D70
✓ Correct Answer: B — 30
(3x + 20) + (2x + 10) = 180; 5x + 30 = 180; 5x = 150; x = 30.
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