Question

at what temperature are the readings of a centigrade and fahrenheit thermometer the same

Answer 1

To find the temperature when both are equal, we use an old algebra trick and just set ºF = ºC and solve one of the equations. So the temperature when both the Celsius and Fahrenheit scales are the same is -40 degrees.

Answer 2

°F =( 9/5 * °C )+ 32

Let °F = °C = x

x = 9/5x + 32

x - 9/5x = 32

-4/5x = 32

x = 32 * -5/4

x = 40

Hence the temeprature equal numerically in both the scales is -40°