At what value of temperature do the celsius and fahrenheit readings have the same numerical value?

Question

At what value of temperature do the celsius and fahrenheit readings have the same numerical value?

Answer 1

Celsius and Fahrenheit are the same numerical value at - 40.

Answer 2

This was actually a question on who wants to be a millionaire...

Anyhow the answer is -40.

Here are the conversion equations

An easy way to remeber this is that water boils at 212F which is 100 C.

to get from 212 to 100

212 - 32 = 180

180 / 9 = 20

20 * 5 = 100

So the steps are subtract 32, divide by 9, then multiply by 5.

C = (F - 32) * 5 / 9

You can trial error to find -40 but the official way would be to use two different temperatures to create a system of equations.  Then you can solve for when they are equivalent.

Answer 3

-40