Answer: 25 people in an elevator that has a maximum load of 20 people
Explanation: Supersaturated solution is defined as the solution in which more amount of solute particles is present than the solvent particles.
1. An empty elevator that has a maximum load of 20 people represents a pure solvent in which no solute is dissolved.
2. A single person in an elevator that has a maximum load of 20 people represents an unsaturated solution in which more solute particles can be dissolved in the solvent.
3. 20 people in an elevator that has a maximum load of 20 people. represents a saturated solution in which no more solute particles can be dissolved in the solvent.
4. 25 people in an elevator that has a maximum load of 20 people represents a supersaturated solution in which in which more amount of solute particles is present than the solvent particles.