CEMC Fermat, 1999

Geometry Difficulty 1.0 Junior Find the answer Canada

The area of $\triangle ABC$ is 60 square units. If $BD = 8$ units and $DC = 12$ units, the area (in square units) of $\triangle ABD$ is

(A) $24$ (B) $40$ (C) $48$ (D) $36$ (E) $6$

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