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please, help me to solve this.How can I proceed.I just need help.

$PQR$ is a triangle. $M$ is a point on $QR$.here,$QM=1/3RM$ , $\angle RPM=30^ \circ$ and $ \angle QPM=20^ \circ$ now,$ \angle PRQ=??$

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What you need is m-n theorem – evil999man Apr 14 '14 at 5:46

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m-n theorem states that $(m+n)\cot\theta=m\cot\alpha-n\cot\beta$

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