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Quedaban= 7/12
Porque:
1= 12/12
12/12-5/12= 7/12
15 litros+20 litros= 35 litros
7/12= 35 litros
1/12= 35/7= 5 litros
Entonces inicialmente había:
12/12= 12×5= 60 litros
R.Había 60 litros inicialmente