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Triangle PQR is equilateral..thus angle P,Q and R are 60 degrees..QRS is a straight line thus angle PRS that is x +angle PRQ=180 degrees..thus 60+x=180...x=120 degrees as PR=RS...angle PSR=angle SPR..thus in triangle PRS 120+y+y=180.....2y=60....y=30
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30 30 is your answer
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