Question 6
The area of triangle $ABC$ is $40\text{ cm}^2$. Points $D,E,F$ are on sides $AB,BC,CA$ respectively, as shown. If $AD=3$ cm, $DB=5$ cm, and the area of triangle $ABE$ is equal to the area of quadrilateral $DBEF$, find the area of triangle $AEC$ in $\text{cm}^2$.
