The measure of ADB is 61°
From the diagram ;
∠ADC = ∠ABC (opposite angles are congruent)
115 = (4x + 6) + 6x - 11
115 = 10x - 5
115 + 5 = 10x
120 = 10x
x = 12
ADB = 6x - 11
ADB = 6(12) - 11
ADB = 61°
Hence, the measure of ADB is 61°
Complete Question:
m∠ABC = 115 ; Find ∠ADB