Question 23
The diagram shows a square swimming pool with a layer of white tiles surrounding it. This inner layer is surrounded by a layer of black tiles and this layer is surrounded by an outer layer of white tiles. There are no gaps between layers or between the inner layer and the swimming pool. Each tile, black or white, is a square of side length 0.5 m. If the number of white tiles is 60 more than the number of black tiles, what is the area, in m² , of the swimming pool?
