On Mon, Apr 11, 2022 at 07:32:12AM -0700, Ethan Furman wrote:

> My apologies for not understanding your example.  The counter example I had 
> in my head, and should have written down, was something like:
> 
>   15mpg * 7l == how many miles?
> 
> where
> 
>   mpg = miles per gallons
>     l = litres
> 
> I'm pretty sure the answer there is not 105.

Indeed. The answer is 27.7 miles.

[steve ~]$ units "15mpg * 7l" miles
        * 27.738065
        / 0.036051541


Or if you prefer an exact answer, Frink gives 625000000/22532213 miles. 
Because one can never have too much precision *wink*

(By the way, those are US gallons and miles. If we use British units 
instead, the answer is 27.738114 miles. A difference of about 7.9cm in 
either direction. If you care.)


-- 
Steve
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