Amusements In Mathematics

Many of the puzzles in this book are based on the currency of Great Britain as used in the early 1900s.

The most common units used were:

the Penny,	abbreviated: d. (from the Roman penny, denarius)
the Shilling,	abbreviated: s.
the Pound,	abbreviated: £

There was 12 Pennies to a Shilling and 20 Shillings to a Pound, so there was 240 Pennies in a Pound.

To further complicate things, there were many coins which were various fractional values of Pounds, Shillings, or Pennies.

	Pounds	Shillings	Pennies
Farthing	£ 1/960	1/48s.	1/4d.
Half-penny	£ 1/480	1/24s.	1/2d.
Penny	£ 1/240	1/12s.	1d.
Threepence	£ 1/80	1/4s.	3d.
Sixpence (or tanner)	£ 1/40	1/2s.	6d.
Shilling (or bob)	£ 1/20	1s.	12d.
Florin	£ 1/10	2s.	24d.
Half-crown	£ 1/8	2s.6d.	30d.
Double-florin	£ 1/5	4s.	48d.
Crown	£ 1/4	5s.	60d.
Half-Sovereign	£ 1/2	10s.	120d.
Sovereign (or Pound)	£ 1	20s.	240d.

This is not a comprehensive list, but it should be adequate to solve the puzzles in this book.