At what temperature the Fahrenheit and Celsius scales of temperature give the same reading ?.

Answer

`-40^(@)C` or `-40^(@)F`

Explanation

Let at `X^(@)F = X^(@)C`
`(X -32^(@))/(180) = (X-0)/(100)`
`10X - 320 = 18X rArr X =-0 40^(@)C`
So, `-40^(@)C or -40^(@)F`