Question 842932
This relies on composition of a composition.  Start with British size, compose for US size, compose for Continental size.  You may want to handle one composition at a time; not everything all at once, so maybe keeping clear what your steps are would be easier than trying to compose the whole thing at once.


British to US is d(x), and x here is not yet some other defined function we know anything about.  Just d(x) relies on the measured British size.


US to Continental is the composition {{{highlight_green(t(d(x)))}}}.
This now should be enough for you to understand the problem question more clearly and you to complete the solution.