It is a matter common knowledge that 0°C is the same as 32 ° F. It is also a known fact that 100 °C equals 212 °F. But there is a temperature that gives the same reading on both Centigrade and Fahrenheit scales.
Can you find this temperature?
Answer: If X is the temperature 9X / 5 = X-32
i.e. 4X /5 = - 32
Which gives X =-40
i.e. - 40°C = - 40 °F.
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