Answer:
![\boxed{70\°}](https://img.qammunity.org/2021/formulas/mathematics/middle-school/w0nifojdwn50w1q3ag6kghibk5h0g91wkx.png)
Explanation:
Angle ABP and angle MAB are corresponding angles.
Corresponding angles are equal.
Angle ABP = 50 degrees
Angle CBP and angle BCQ are corresponding angles.
Corresponding angles are equal.
Angle CBP = 20 degrees
Angle ABC is the sum of angles CBP and ABP.
![50+20=70](https://img.qammunity.org/2021/formulas/mathematics/middle-school/l20b9517z2vn8qpcqv0qjmf4l9jt8x3qz8.png)