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Find the number of square tiles to cover the floor of a room measuring 4 m * 9 m leaving 0.25 m space around the room. A side of square tile is given to be 25 cms?

Correct answer: B. 476

  • A. 425
  • B. 476
  • C. 450
  • D. 350

Explanation

Leaving a 0.25 m border on every side leaves a floor area of (4 m - 0.5 m) x (9 m - 0.5 m) = 3.5 m x 8.5 m = 29.75 m². Each tile has side 25 cm = 0.25 m and area 0.25 m x 0.25 m = 0.0625 m², so tiles needed = 29.75 m² / 0.0625 m² = 476. Option b is correct; option c results from using the full room area and then rounding incorrectly.

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