Answer:
40
Step-by-step explanation:
Assuming that these two lines are parallel, the two angle measures must be supplementary, or add to 180. Thus:
2k+(2k+20)=180
4k+20=180
4k=160
k=40
2k and 2k + 20 are co - interior angles.
Sum of co - interior angles is 180,
2k + 2k + 20 = 180
4k = 180 - 20
4k = 160
k = 160 / 4
x = 40
