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A 24 m by 18 m floor is covered with the largest identical square tiles. How many tiles are used?

A12
B24
C36
D72
Answer & Solution
Correct answer: A. 12
The side is the HCF of 24 and 18, which is 6 m, so the floor holds 4 tiles along the length and 3 along the width, making 12.
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