Final answer:
To convert from Fahrenheit to Celsius, use the formula C = (F - 32) × 5/9. The winter room temperature of 68.0°F is equivalent to 20°C, and the summer temperature of 78.0°F is 25.56°C.
Step-by-step explanation:
The question is asking to convert temperatures from Fahrenheit to Celsius to see what they would be on the Celsius scale. This involves using the formula for converting Fahrenheit (F) to Celsius (C), which is C = (F - 32) × 5/9. Let's calculate the temperatures using this formula:
- Winter temperature: 68.0°F = (68.0 - 32) × 5/9 = 36 × 5/9 = 20°C
- Summer temperature: 78.0°F = (78.0 - 32) × 5/9 = 46 × 5/9 = 25.56°C
Therefore, to conserve energy, room temperatures are kept at 20°C in the winter and 25.56°C in the summer when converted to the Celsius scale.