Răspuns :
cu regula de 3 simpla.daca dina 100cm3.............109 cm3gheata
1l.........................x
x=(1l*109cm3)/100cm3
x=1,09l
1,09l-1l=0,09l=0,09*1000cm3=90cm3
1l.........................x
x=(1l*109cm3)/100cm3
x=1,09l
1,09l-1l=0,09l=0,09*1000cm3=90cm3