THE PROFESSOR'S PUZZLES
67.—
The Coinage Puzzle.
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 2 must be placed
in one of the corners. Other-
wise fractions must be used, and
these are supplied in the puzzle
by the employment of sixpences
and half-crowns. 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.
4s.
64.
Is.
5s.
\ 2s.64.
4s.
4s.
5s.
2 s.
2s.6<<.
<5i
2s.
Ss.
6i. i
68.—
The Postage Stamps
Puzzles.
The first of these puzzles
is based on a similar prin-
ciple, though it is really
much easier, because the
condition that nine of the
stamps must be of different
values makes their selection
a simple matter, though
how they are to be placed
requires a little thought or
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