[![enter image description here](https://i.stack.imgur.com/jgto0.png)](https://i.stack.imgur.com/jgto0.png)

Area of $ABC$ triangle is $24\,\mathrm{cm}^2,$ $\frac{BM}{AB}=\frac{1}{3}$ and $\frac{AN}{AC}=\frac{1}{3}$. E is a midpoint of MN. What is the area of $BEC$ shaded triangle?

I don't know how to calculate the area of the shaded triangle, All I can think of is using triangle similarity or some sort of ratios with area/sides but I can't find it