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2 × 18 + 3x = 3 × 18 + 2x
3x + 36 = 2x + 54
x = 18 dag
Złoto waży tylko co 4 pudełka + 18 dag.
4 × 18 + 18 = 72 + 18 = 90 dag.
Odp. Złoto Cichego Bo waży 90 dag.