Answer:
8400 tiles
Step-by-step explanation:
Note: "each 30 cm" must be "each 30 cm²"
then
1 m = 100cm
1m² = 100cm * 100cm = 10000cm²
30 cm³ = 30/10000 = 0.003m²
each tile = 0.003m²
Total área:
6m * 4.2m = 25.2m²
then:
25.2m² / 0.003m² = 8400
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