On the Fahrenheit and Celsius scales, at what temperature is Fahrenheit twice the centigrade?

Step 1: Analyze Question 1.
The relationship between Fahrenheit ($F$) and Celsius ($C$) scales is given by the formula $F = \frac{9}{5}C + 32$.
We are given the condition that the Fahrenheit scale is twice the centigrade scale, so $F = 2C$.

Step 2: Substitute the condition into the formula and solve for $C$.

$$2C = \frac{9}{5}C + 32$$

Subtract $\frac{9}{5}C$ from both sides:

$$2C - \frac{9}{5}C = 32$$

Convert $2C$ to a fraction with a denominator of 5:

$$$$