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2/5*1/3 = (2*1)/ (5*3) = 2/15
t/3 + 2t/15 +600 = t
600 = 15t/15 -5t/15 - 2t/15
600 = 8t/15
t = 600*15/8
t = 1125
Respuesta:
Al principio habían 1125 litros