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7 m * (10 dm/1m) = 70 dm
20 Dm*(100 dm/1 Dm) = 2000 dm
3 m * (10 dm/ 1m) = 30 dm
Longitud del alambre = 3000 dm + 70 dm = 3070 dm
Longitud vendida = 2000 dm + 30 dm = 2030 dm
Longitud que falta por venderse = 3070 dm - 2030 dm = 1040 dm