$$\(P Q R\)$$ is a triangle. $$\(T\)$$ is a point on $$\(P R\)$$ and $$\(U\)$$ is a point on $$\(P Q\)$$. $$\(R Q\)$$ is parallel to $$\(T U\)$$. $$\(\quad P T: T R=4: 3\)$$ (a) Find the ratio $$\(P U: P Q\)$$. : .................. .................. (b) The area of triangle $$\(P U T\)$$ is $$\(20 \mathrm{~cm}^{2}\)$$. Find the area of the quadrilateral $$\(Q R T U\)$$. ...................................... $$\(\mathrm{cm}^{2}\)$$

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