Question

this answer math chapter is 6 ​

Answer 1

These three angles are on staright line

and we know the angle of straight line=180°

ATQ

x+65°+2x-20=180°

3x+45=180

3x=180-45

3x=135

x=45

So

First angle=45°

Second angle=65°

Third angle=2×45-20=70°

Alternative method was (linear pair)