What is the total number of deck boards needed for a deck that is 5 feet wide and 4 feet long, if each deck board is 4 feet long?

To calculate the total number of deck boards needed for a deck that is 5 feet wide and 4 feet long, you would first find the perimeter of the deck, which is 18 feet. Since each deck board is 4 feet long, you would divide the perimeter by the length of each board to get the total number of boards needed, which is 4.5 boards. Since you can't buy half a board, you would need to round up to 5 boards.