Answer

$3 : 2$

In $\triangle A B C$ and $\triangle A B D$,

$\triangle A B C$ and $\triangle A B D$ have the same height. ...(Given)

The ratio of the areas of two triangles with equal heights is equal to the ratio of their corresponding bases.

$\therefore \frac{A(\triangle A B C)}{A(\triangle A B D)}=\frac{B C}{B D}$

$\therefore \frac{A(\triangle A B C)}{A(\triangle A B D)}=\frac{12}{8}$

$\therefore \frac{A(\triangle A B C)}{A(\triangle A B D)}=\frac{3}{2}$

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