Answer:
Step-by-step explanation
The Atlantic has  2  x 10^16
= 20,000,000,000,000,000 gallons of water.
Required volume of water in terms of Lake Ontario
  20,000,000,000,000,000
= Â ---------------------------------------
        8,000,000,000,000
= Â 20,000 /8
= Â 2500.