21) 80, if you were to extend the upper line you would create a triangle, with another angle with 60 degrees, since the line has been intersected by two parallel lines, then you have a triangle with 2 known angles, 60, 20. the sum of all the internal angles of a trinagle must be 180 so the third angle must be 100.
60+20+x=180
22) 108, using the same reasoning
