8. Find the number of cans needed

Pavithra buys a cuboidal board to showcase her family pictures. Before mounting the board on the wall, she decides to paint the board thoroughly. The length, breadth and height of the board are 18 $cm$, 6 $cm$, and 13 $cm$ respectively. If each can of paint can fill up to 50 $cm^2$ of area,  how many cans of paint is needed altogether.

 

 

 cans of paint is required.