A bathroom floor measures 3.5 m in length and 2 m in width. One of its walls, which is to be tiled fully, measures 2 m in length and 2.5 m in height. If square tiles of side 25 cm are used, and an extra 12% of tiles are purchased to cover cuts and wastage, how many tiles are needed in total?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 90.
Wall area = 2 m × 2.5 m = 5 m2 = 50000 cm2
Tile area = 25 × 25 = 625 cm2
Tiles needed = 50000/625 = 80
Extra 12% = 80 × 0.12 = 9.6
Total tiles = 80 + 9.6 = 89.6 ≈ 90