Răspuns :
7*18 = 126 litri - economisim intr-o saptamina
365*18= 6570 litri - economisim intr-un an
366*18=6588 litri - economisim intr-un an bisect
365*18= 6570 litri - economisim intr-un an
366*18=6588 litri - economisim intr-un an bisect