Well, as an object is in a fluid, it displaces the water and more of one or more different objects same or different will cause more water displacement.
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It says that the buoyant force acting on the object is equal
to the weight of the fluid displaced by the object.
The buoyant force of an object is equal to the mass of the fluid displaced by the same object in order for it to sink.
Buoyant force = Density of fluid * Volume displaced by solid * Gravitational acceleration.