shay.quest · two

The Thirsty
Crow

Aesop's crow found a pitcher it couldn't reach into, so it dropped in pebbles until the water came up to meet it. Three vessels. Each one has a line marked on it. Work out how many pebbles it takes to bring the water exactly to the line — then drop them all at once.

Guessing is allowed. The crow has infinite patience and so does the water.