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Substances with lower densities will float in substances with higher densities. The egg had a higher density then water so it sank. But when salt was added, the density of the water, which became salt water, was higher than the egg's, so the egg started to float


Usually, a substance with lower density will float in substances with higher density. In the first part of the experiment, egg sunk in water, this happen because egg has higher density than water. At the second part of the experiment, egg floated on the salt water, this happens as salt raises the density by adding more mass, to the same volume of water. Thus, the egg float.