GED Math · Question of the Day

GED Math Question of the Day

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Monday, September 21, 2026

The temperature conversion from Fahrenheit $F$ to Celsius $C$ is $C = \frac{5}{9}(F - 32)$ . The conversion from Celsius $C$ to Kelvin $K$ is $K = C + 273.15$ . A substance is kept at a temperature of $T$ degrees Fahrenheit. A chemical reaction causes its temperature to drop to a new temperature that is half the original value, also in degrees Fahrenheit. Which expression represents the final temperature in Kelvin?

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Question of the Day

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$\frac{5T}{18} + 255.4$
$\frac{5}{9}(\frac{T}{2} - 32) + 273.15$ (correct answer)
$\frac{1}{2}(\frac{5}{9}(T - 32) + 273.15)$
$\frac{5}{9}(\frac{T-32}{2}) + 273.15$

Explanation: Let the original temperature be $T$ in degrees Fahrenheit. The final temperature in Fahrenheit is $\frac{T}{2}$ . We need to convert this final Fahrenheit temperature to Kelvin. First, convert the final Fahrenheit temperature to Celsius. Let $F_{final} = \frac{T}{2}$ . Using the formula, $C_{final} = \frac{5}{9}(F_{final} - 32) = \frac{5}{9}(\frac{T}{2} - 32)$ . Next, convert this Celsius temperature to Kelvin: $K_{final} = C_{final} + 273.15 = \frac{5}{9}(\frac{T}{2} - 32) + 273.15$ . Choice A represents the simplified form with decimal approximation. Choice C represents halving the Kelvin temperature, not the Fahrenheit. Choice D represents halving the Celsius equivalent, not the Fahrenheit reading itself.