At what temperature does the Fahrenheit reading equal twice the Celsius temperature?
A)160 °C,320 °F
B)12 °C,24 °F
C)-12 °C,-24 °F
D)-288 °C,-576 °F
E)40 °C,80 °F

Question

Quizplus · Accepted Answer

Let's assume that the Celsius temperature is "x". Then the Fahrenheit temperature would be (9/5)x+32. 
According to the problem, 
(9/5)x+32=2x
9x+160=10x
x=160
Substitute x=160 into the Celsius and Fahrenheit formulas to get the temperatures in the desired units:
Celsius = 160°C 
Fahrenheit = 2(160) = 320°F.

At What Temperature Does the Fahrenheit Reading Equal Twice the Celsius