51.--HOW OLD WAS MARY?

Here is a funny little age problem, by the late Sam Loyd, which has been

very popular in the United States. Can you unravel the mystery?

The combined ages of Mary and Ann are forty-four years, and Mary is

twice as old as Ann was when Mary was half as old as Ann will be when

Ann is three times as old as Mary was when Mary was three times as old

as Ann. How old is Mary? That is all, but can you work it out? If not,

ask your friends to help you, and watch the shadow of bewilderment creep

over their faces as they attempt to grip the intricacies of the

question.

Amusements in Mathematics · 第 66 / 970 题