Final answer:
The thermometer in question is not calibrated according to standard points. Under normal circumstances, the Celsius scale is used with 0°C as the freezing point and 100°C as the boiling point of water. Without a calibration correction, the temperature read directly as 25°C is the best answer we can provide.
Step-by-step explanation:
The student is referring to a thermometer that is not properly calibrated since it reads 1°C at the melting point of ice and 99°C at the boiling point of water, which is off by 1°C for each reference point. However, if we ignore this detail and assume a linear scale, the thermometer gives a reading at a certain temperature proportionally. On the Celsius scale, the freezing point of water is 0°C and the boiling point is 100°C, whereas on the Fahrenheit scale, the freezing point of water is 32°F and the boiling point is 212°F. To find the correct temperature when the thermometer reads 25°C, we would typically use the provided scales correctly without any calibration error. Given the thermometer's non-standard readings, it is not possible to provide a "correct" temperature other than the direct reading of 25°C without more information on the intended calibration or correction factor.