Answer:
The point of this puzzle turns on the fact that if
the magic
square were
to be composed of whole numbers adding up 15 in all ways, the two must
be
placed in one of the corners.
Otherwise fractions must be used, and
these
are supplied in the puzzle by the employment of sixpences and
halfcrowns.
I give the arrangement requiring the fewest possible
current
English coins—fifteen.
It will be seen that the amount in
each corner is
a fractional one, the sum required in the total being a whole number of
shillings.
