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EL angulo(∡)ABD = x + 40°
El angulo(∡)DBC = 2x + 20°
El angulo(∡) ABC = 90° Por ser Recto
∡ABC = ∡ABD + ∡DBC
90° = x + 40° + 2x + 20°
90° = 3x + 60°
90° - 60° = 3x
30° = 3x
30°/3 = x
10° = x
Respuesta.
x = 10°
Opcion e