P6 / Catholic High / 2021 / SA2 / Paper 2 – Q17 [4 marks]

Question:

Mr Lee tries to cover a square floor with as many rectangular tiles of the same size as possible that follow a pattern as shown. The tiles are either white or grey.
(a) What is the greatest possible number of tils that Mr Lee can use to cover the floor?
(b) Of the greatest possible number of tiles that Mr Lee can use to cover the floor, how many of the tiles are grey tiles?