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1 kg szynki - 18, 20 zł
1 kg sera = ?
1 kg = 100 dag
100 dag = 18,20 zł
30 dag = x zł
100 × x = 18,20 × 30
100x = 546
x = 546 ÷ 100
x = 5,46 (zł)
2/5 kg = 40 dag
40 dag = 11,26 zł - 5,46 xł
40 dag = 5,80 zł
100 dag - x
40 dag - 5,80 zł
100 × 5,80 = 40 × x
580 = 40x
x = 580 ÷ 40
x = 14, 50 (zł)
1 kg sera = 14,50 zł
Odp. 1 kg sera kosztował 14,50 zł.