Question

Two cups are filled to the same level with water. one of the two cups has ice cubes floating in it. when the ice cubes melt, in which cup is the level of the water higher?

Answer 1

It is the same in both. 

"When the ice cubes melt, they turn into an amount of water having the same weight. This weight is also equal to the weight of the water originally displaced by the cubes. Since the densities of the melted ice and the surrounding water are identical, the volume occupied by the melted ice exactly equals the volume of displaced water."