All equivalent temperatures are considered the same, eg 10oC is considered the same as 50oF, 100oC is considered the same as 212oF.
However, I think you're asking for which temperature has the same value in both scales: -40oC = -40oF
To convert Celsius into Fahrenheit, the formula is:
F = C x 9/5 + 32
For the temperature to be the same C = F, thus:
F = 9/5F + 32
⇒ 4/5F = - 32
⇒ F = -40
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160 Celsius = 320 Fahrenheit
the temperature where Fahrenheit and Celsius scale show the same numeric value is - 40
12
The Celsius scale has its 'zero' at the same temperature as 32 on the Fahrenheit scale, and each Celsius degree is the same size as 1.8 Fahrenheit degrees.
the temperature is 34 degrees