In the given figure if DE || BC then find AD.

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Solution

The correct option is A 30
According to BPT,
$\frac{A D}{D B} = \frac{A E}{E C}$
$\Rightarrow \frac{A D}{45} = \frac{20}{30}$
$\Rightarrow A D = \frac{20 \times 45}{30} = 30$

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