We have to add the areas from A to F.
We then can write:

As each area is a rectangle, the area is the product of the sides.
We can also simplify and see that:


Then:

The surface of one chest is 1866 square inches.
The four chests will represent:

If each can paints 933 square inches, she will need:

Answer:
Each chest has a surface of 1866 sq. in.
The four chest represent 7464 sq. in. of surface area.
She needs 8 cans of paint to paint all 4 chests.