Problem: In the figure, lines I and m are parallel. If y – z = 60, then what is the value of x?

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Correct Answer: ans: 120°
Explanation:
According to the question,y + z = 180° ……..(i)and y – z = 60° ……..(ii)
(i) + (iI)=>2y = 240°
y = 120°
Again, y° = S° = 120°
=>s°= x° = 120°