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or If $AD$ and $PM$ are the medians of triangles $\triangle ABC$ and $\triangle PQR$, respectively where $\triangle ABC \sim \triangle PQR$, prove that $\frac{AB}{PQ} = \frac{AD}{PM}$. $10$. Find the unknown entries $a, b, c$ and $d$ in the following distribution of heights of students in the class. Height (in cm) $f$ $cf$ $150$$-155$ $PM$$0$ $12$ $155$$-160$ $13$ $PM$$1$ $160$$-165$ $10$ $35$ $165$$-170$ $PM$$2$ $43$ $170$$-175$ $7$ $d$ $PM$$4$ Solve the following system of equations by elimination method: $PM$$5$ and $PM$$6$ Page $2$ of Set $2$