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Lines l and m are parallel. The two marked angles are co-interior (on the same side of the transversal, between the lines). Find $x$ .

Class 8Equations in GeometryLinear Equations

A53°
B40°
C20°
D60°

Step-by-Step Solution

Co-interior angles add to 180°:

(x + 40) + (2 x + 20) = 180

, so

3 x = 120, x = 40°

.

Answer: B) 40°

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