Discussion
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?
Answer: B
The 0.25 m border runs along all four sides, so each dimension loses twice that.
\[ \text{tiled area} = (4 - 0.5)(9 - 0.5) = 3.5 \times 8.5 = 29.75 \text{ m}^{2} \]
\[ \text{tile} = 0.25 \times 0.25 = 0.0625 \text{ m}^{2} \]
\[ n = \frac{29.75}{0.0625} = 476 \]
Subtracting only 0.25 m from each dimension instead of 0.5 is the usual slip - the space is left on both opposite sides.
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