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Pś = 2 * 700 cm * 120 cm + 2 * 300 cm * 120 cm
Pś = 168 000 cm² + 72 000 cm²
Pś = 240 000 cm²
Pc = 210 000 cm² + 240 000 cm² = 450 000 cm²
Ppłytki = 20 cm * 20 cm = 400 cm²
450 000 cm² : 400 cm² = 1125
Odp. Potrzeba 1125 płytek.