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To solve this problem, we need to convert a temperature from Fahrenheit to Celsius using the formula provided:

\[
C = \frac{5(F - 32)}{9}
\]

where:
- \( F \) is the temperature in Fahrenheit,
- \( C \) is the temperature in Celsius.

### Step-by-Step Solution
1. **Substitute the Fahrenheit value** \( F = 77 \) into the formula:
   \[
   C = \frac{5(77 - 32)}{9}
   \]

2. **Calculate the value inside the parentheses**:
   \[
   77 - 32 = 45
   \]

3. **Multiply by 5**:
   \[
   5 \times 45 = 225
   \]

4. **Divide by 9**:
   \[
   \frac{225}{9} = 25
   \]

### Answer
The Celsius temperature is:
\[
C = 25^\circ \text{C}
\]

Let me know if you want further details or have questions about any steps.

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### Related Questions
1. How would you convert a Celsius temperature back to Fahrenheit?
2. What would the Celsius temperature be if the Fahrenheit reading was 32°?
3. Can this formula be rearranged to directly solve for Fahrenheit when Celsius is known?
4. What is the significance of 32 and 9/5 in the Fahrenheit to Celsius conversion?
5. How would this calculation change if working with Kelvin instead of Celsius?

### Tip
When converting temperatures, remember that 32°F is the freezing point of water, equivalent to 0°C, and can help you quickly estimate conversions.

Use the conversion formula \( C = \frac{5(F - 32)}{9} \) to find the Celsius temperature reading if the Fahrenheit reading is 77°.

Learn how to convert a Fahrenheit temperature of 77° to Celsius using the conversion formula C = (5(F - 32)) / 9. Follow a step-by-step solution to understand the calculation process. Ideal for students in Grades 6-8.

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