∵△ABC
∴∠B+∠C+∠BAC = 180°
∵∠B=70°∠C=40°
∴∠BAC = 70°
∵AD是∠BAC的角平分线
∴∠BAD = ∠DAC = 35°
∠ADC = ∠B + ∠BAD = 105°