The dimensions of the rectangular fish aquarium are:
length = 31 inches, width = 13 inches and depth = 28 inches
If Simpson covers all the four glass walls of the aquarium.
We have to determine the covering he needs.
So, Covering required for four walls of the aquarium
=

=

=

=

= 2464 square inches
So, Simpson needs 2464 square inches of covering to cover all the four glass walls of the aquarium.