19.--THE NEW YEAR'S EVE SUPPERS.

The proprietor of a small London café has given me some interesting

figures. He says that the ladies who come alone to his place for

refreshment spend each on an average eighteenpence, that the

unaccompanied men spend half a crown each, and that when a gentleman

brings in a lady he spends half a guinea. On New Year's Eve he supplied

suppers to twenty-five persons, and took five pounds in all. Now,

assuming his averages to have held good in every case, how was his

company made up on that occasion? Of course, only single gentlemen,

single ladies, and pairs (a lady and gentleman) can be supposed to have

been present, as we are not considering larger parties.

Amusements in Mathematics · 第 28 / 970 题