Answer:
1 litre = 1,000ml
So there will be 600ml, or 0.6 litres left.

Answer:
750ml x 9 = 6,750ml. Half of 750ml = 375ml.
In total there are 7,125ml or 7.125 litres

Answer:

One fifth of 330,000 gallons is 66,000 gallons.

Therefore, four fifths = 264,000 gallons