You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "how many british shillings are in a pound?" whose answer is 20.
Each document should contain about 30 words, and these documents should contain useful information.

Query: how many british shillings are in a pound
Useful Output:

Doc 1: 1 pound = 20 shillings · 1 shilling = 12 pence · 1 penny = 4 farthings · 1 halfpenny = 2 farthings · 3 pence = 1 thruppence · 6 pence = 1 sixpence · 2
Doc 2: One pound was made up of 240 pence, with 12 pence to the shilling and 20 shillings to the pound.
Doc 3: The UK overhauled its currency in 1971 and no longer uses shillings. Now the British pound is made of 100 pence. "Quid" is slang for "pound"
Doc 4: Older people still thought in terms of 20 shillings in a pound. Before inflation really undermined the value of the pound, it seemed it was basically a two
Doc 5: Note that prior to February 15, 1971 ("Decimal day," or "D-day"), monetary amounts in the U.K. were expressed as pounds (£), shillings (s.) and pence (d.),