374--CROSSING THE RIVER AXE.

Many years ago, in the days of the smuggler known as "Rob Roy of the

West," a piratical band buried on the coast of South Devon a quantity of

treasure which was, of course, abandoned by them in the usual

inexplicable way. Some time afterwards its whereabouts was discovered by

three countrymen, who visited the spot one night and divided the spoil

between them, Giles taking treasure to the value of £800, Jasper £500

worth, and Timothy £300 worth. In returning they had to cross the river

Axe at a point where they had left a small boat in readiness. Here,

however, was a difficulty they had not anticipated. The boat would only

carry two men, or one man and a sack, and they had so little confidence

in one another that no person could be left alone on the land or in the

boat with more than his share of the spoil, though two persons (being a

check on each other) might be left with more than their shares. The

puzzle is to show how they got over the river in the fewest possible

crossings, taking their treasure with them. No tricks, such as ropes,

"flying bridges," currents, swimming, or similar dodges, may be

employed.

Amusements in Mathematics · 第 437 / 970 题