Ladies' Diary/Dutchmen's Three Wives/Proof 2

Puzzle

There came $3$ dutchmen of my acquaintance to see me, being lately married;

they brought their wives with them.

The men's names were Hendrick, Claas, and Cornelius;

the women's Geertrick, Catriin, and Anna;

but I forget the name of each man's wife.

They told me that they had been at market, to buy hogs;

each person bought as many hogs as they gave shillings for each hog;

Hendrick bought $23$ hogs more than Catriin,

and Claas bought $11$ more than Geertrick;

likewise, each man laid out $3$ guineas more than his wife.

I desire to know the name of each man's wife.

Note that a guinea is $21$ shillings.

Hendrick bought $32$ hogs and his wife Anna bought $31$

Claas bought $12$ hogs and his wife Catriin bought $9$

Cornelius bought $8$ hogs and his wife Geertrick bought $1$.

It is immediate from the last condition that each man paid $63$ shillings more than his wife.

It is also immediate from the first condition that the amount paid for the hogs by each person is a square number.

So we are looking for pairs of square numbers which differ by $63$.

This leads us to the pairs:

$\tuple {1^2, 8^2}$, that is $\tuple {1, 64}$

$\tuple {9^2, 12^2}$, that is $\tuple {81, 144}$

$\tuple {31^2, 32^2}$, that is $\tuple {961, 1024}$

The relations between Hendrick and Catriin, and Claas and Geertrick, provide us with the information we need to match husband and wife for all three.

$\blacksquare$

This proof of the problem of the Dutchmen and their $3$ wives is reported as being the work of Mr N. Farrer, whose identity is not known.

1992: David Wells: Curious and Interesting Puzzles ... (previous) ... (next): The Ladies' Diary or Woman's Almanac, $\text {1704}$ – $\text {1841}$: $141$