Convert 25°C to Fahrenheit.

Convert 25°C to Fahrenheit.

• A. 72 °F
• B. 77 °F
• C. 80 °F
• D. 83 °F

Answer: (B)

Converting Celsius to Fahrenheit uses the formula F = (C × 9/5) + 32. For 25°C, multiply by 9/5 to get 25 × 9/5 = 45, then add 32 to shift from Celsius to Fahrenheit: 45 + 32 = 77. So 25°C is 77°F. The 32-degree offset comes from the different zero points of the scales, so you must include that offset after scaling. Forgetting the offset would give a much smaller number (for example, 25°C would be 45°F without the 32 added). Using a rough rule like doubling the Celsius would also misplace the result, highlighting why the exact formula yields the correct value.

Converting Celsius to Fahrenheit uses the formula F = (C × 9/5) + 32. For 25°C, multiply by 9/5 to get 25 × 9/5 = 45, then add 32 to shift from Celsius to Fahrenheit: 45 + 32 = 77. So 25°C is 77°F. The 32-degree offset comes from the different zero points of the scales, so you must include that offset after scaling. Forgetting the offset would give a much smaller number (for example, 25°C would be 45°F without the 32 added). Using a rough rule like doubling the Celsius would also misplace the result, highlighting why the exact formula yields the correct value.