[Basket_of_Deplorables]

Care to show your work?

[eastforker]

The lead displaces less water than the boat that floats it. Had it been a bucket of water thrown overboard it would have remained the same.

[going hot]

The boat displaces so much water with the weight. When the weight is removed, the boat sits higher, displacing less water. The water rushing in to replace the volume the boat was previously occupying causes the total volume of the water to shrink.