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In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
Solution: How many books are there in the British Library?
Why? In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

New input: Article: Elizabeth's Second! In 60 years, the Queen has never put a foot wrong in public. And for the last 24 of them, it turns out she's had a secret weapon -- the nice Ella Slack. The former BBC manager has, unknown to anyone except a handful of key advisers, spent the last quarter of a century acting as the Queen's official stand-in at rehearsals for royal events. The 69-year-old has never accepted a penny for her royal service, considering it "a pleasure and an honour" to ensure that everything runs smoothly for the Queen. "How many people in the world have had a chance to sit in a royal landau or walk onto the dais at Windsor Castle even before the Queen has done so?" she said. While Miss Slack may not resemble the Queen facially, she has a similar figure to the Queen, standing just 5 foot. The Queen is 5 foot 2 inch. She began her remarkable role in 1988, when she was working as manager of the BBC's sports and events department. A producer asked her if she could stand in for the Queen to check camera angles at a rehearsal -- and her second career was born. Since then, from the State Opening of Parliament to the 50th anniversary of Victory day, wherever the Queen is on duty Miss Slack is likely to have been there first. She has perfected her own version of the Queen's clothes, including a black patent handbag she bought in a charity shop for PS1, and even styles her hair like the Queen.
Answer: She and Miss Slack have a lot in common.
Solution:
What's the Queen's secret weapon?