Find the number of marble slabs of size 20cm×30cm required to pave the floor of a square room of side 3 metre.
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3 m * 3 m
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20cm*20cm
3*100cm * 3 * 100 cm
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20 cm * 20 cm
300 * 300
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20 * 20
15 * 15
225 slabs
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