The thermometers show the following temperatures: The first thermometer shows a temperature of 18°C. The second thermometer shows a temperature of 24°C. The third thermometer shows a temperature of 31°C.

Solution:

• The first thermometer indicates 18°C (the liquid level is above 10°C and below 20°C, at the 8th mark).
• The second thermometer indicates 24°C (the liquid level is above 20°C and below 30°C, at the 4th mark).
• The third thermometer indicates 31°C (the liquid level is above 30°C and below 40°C, at the 1st mark).

Answer: 18, 24, 31