I---I---I---I---I---I---I, un segment = 1 kg cartofi
I---I---I +24 lei ⇒ 4segmente = 24 ⇒ 1 segment = 1 kg = 24:4 = 6 lei
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Si algebric(ca verificare): 6x=24+2x, 4x = 24, x=6 lei/kg