Question

At which temperature do the readings of the celcius and the Fahrenheit scales coincide ?

• A. $0$
• B. $100$
• C. $-40$
• D. $-80$
• E. None of the above

Answer 1

Answer: (C)

$-40$

We know the relation between celsius and Fahrenheit is given by ,

${}^{0}C=\frac{9}{5}{\times }^{0}F+32$

For readings to coincide , ${}^{0}C{=}^{0}F$

${}^{0}C=\frac{9}{5}{\times }^{0}C+32$

On Solving, ${}^{0}C=-40$