How many 550 mm × 550 mm tiles doe's siyabonga need to tile the bathroom?

To calculate the number of tiles needed to tile the bathroom, we first need to determine the area of the bathroom that needs to be tiled. Let's assume the bathroom is a square with dimensions 550 mm x 550 mm.

The area of the bathroom can be calculated as:
Area = length x width
Area = 550 mm x 550 mm
Area = 302,500 mm²

Next, we need to determine the area of each tile. Since each tile has dimensions of 550 mm x 550 mm, the area of each tile is:
Area of tile = 550 mm x 550 mm
Area of tile = 302,500 mm²

To find out how many tiles are needed, we divide the total area of the bathroom by the area of each tile:
Number of tiles = Total area of bathroom / Area of each tile
Number of tiles = 302,500 mm² / 302,500 mm²
Number of tiles = 1

Therefore, Siyabonga needs 1 tile to tile the bathroom.

This question cannot be answered from the given context because the dimensions of the bathroom are not provided.