Tom has a regular aquarium (like shown in the picture)
He once planned to clean it for the
new fishes his dad said is going to
bring it from the store.
While leaving for the store, his dad
asked Tom to fill the tank exactly in
half by the time he returns
Tom looked around the house but
did not find even one measuring
equipment. But still he managed to
fill in exactly half the tank without
measuring the water with anything.
Can you find out how?
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