Discussion
50 square stone slabs of equal size were needed to cover a floor area of 72 sq.m. Find the length of each stone slab.
Answer: C
Divide the total area between the slabs, then take the square root.
\[ \text{area of one slab} = \frac{72}{50} = 1.44 \text{ m}^{2} \]
\[ \text{side} = \sqrt{1.44} = 1.2 \text{ m} = 120 \text{ cm} \]
The slabs are square, so the side is the square root of the area - and the answer is asked for in centimetres, hence the factor of 100.
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