a) 840
b) 841
c) 820
d) 814
Answer: d
Explanation: Length of the room
= 15 m 17 cm
= 15 × 100 + 17
= 1517 cm.
Breadth of the room
= 9 m 2 cm
= 902 cm.
The HCF of the 1517 and 902 will be size of square tiles.
HCF of 1517 and 902 = 41 cm.
Area of the room
= length × breadth
= 1517 × 902 cm2
Area of tiles = 41 × 41 cm2
Number of tiles required
= $$\frac{{1517 \times 902}}{{41 \times 41}}$$
= 814 tiles
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