On Sun, 31 Dec 2006 14:57:34 +0100
Robert Klemme <shortcutter / googlemail.com> wrote:

>
> 
> Temperature conversion
> 
> +10.0C is -12.2F
> +10.0F is +50.0C
> +20.0F is +68.0C
> 

Not according to units:

 $ units
2438 units, 71 prefixes, 32 nonlinear units

You have: tempC(10)
You want: tempF
        50
You have: tempF(10)
You want: tempC
        -12.222222
You have: tempF(20)
You want: tempC
        -6.6666667

I think you may have your formulae backwards.

-jonathan