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Answer:
∠R=140°
To solve,
draw a parallel line through Q, parallel to line l and m
name it n,
now, line n divides ∠Q such that, its upper angle is equal to 60°(since, ∠P=upper angle of ∠Q)
therefore, lower angle will be 40° (100-60=40)
since, lower ∠Q+∠R=180
40+∠R=180
therefore, ∠R=140°
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