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a) 1 litro = 2/9 = 144 botellas
b) 2 litros = 3/8 = 243 botellas
c) El restante de 1/2 litro = 29/72 = 261 botellas
Los datos se obtienen asi:
a) 648 *2/9 = 144
b) 648*3/8 = 243
c) 1-2/9-3/8 = 29/72
648*29/72 = 261
Comprobamos
144+243+261 = 648 botellas
Saludos :D