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4×25 litros= 100 litros
》Cada uno se saca 7 litros
4×7litros = 28 litros
》Restando
100 litros - 28 litros = 72 litros
R= quedan 72 litros en total
25×4=100
De cada barril se saca 7 litros
100-7-7-7-7=72
¿Cuantos litros quedan en total? 72 litros