How many steel plate 120x240 in 30 square meter
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I'm going to assume that the 120 and 240 are in cm....converting these to meters, we have
1.2 and 2.4. So each steel plate has an area of (1.2m)*(2.4m) = 2.88m2
So....(30m2 ) / (2.88m2 ) ≈ 10.42 plates......