The House Where She Lives
It was at a cocktail party in New York that I met Stephen. We exchanged our phone numbers and decided to meet each other soon. When she rang up and invited me to her house this is how she gave me the number of her house: "I live in a long street. Numbered on the side of my house are the houses one, two, three and so on. All the numbers on one side of my house add up to exactly the same as all the numbers on the other side of my house. I know there are more than 5 houses in my street but not so many as 30". Find Stephanie's house number.
The answer is 6.
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