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Enigmas and puzzles

By Ian Stewart   May 2008

“Since it’s your birthday today,” Ambrose said to his wife in a fit of generosity, “let’s visit the secondhand bookshop and buy some books.”

“My wife and I will join you,” said his friend Benedict. “It’s not her birthday, but what the heck, we can always use a few more books. What do you think, ladies?”

“Good idea,” said Raquel.

“I agree,” said Saffron.

They had a great time choosing books—so much so that each couple, husband and wife, spent a total of £221.

“That’s strange—all my books cost the same,” said Raquel. “In fact, the price of each…

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