Final answer:
The cell in a solution with a higher concentration of water and a lower concentration of salt is in a hypotonic solution because water will enter the cell to equalize solute concentrations.
Step-by-step explanation:
If a cell contains 60% water, 10% salt, and 30% other materials, and the solution in which it is placed contains 75% water, 5% salt, and 20% other materials, we can determine the tonicity of the solution by comparing solute concentrations and predicting the movement of water. In this case, the solution has a higher concentration of water and a lower concentration of salt than the cell. Therefore, water would tend to move into the cell to equalize the solute concentrations, making it a hypotonic solution.