Henry Ernest Dudeney/Modern Puzzles/85 - The House Number

by : $85$

 * The House Number
 * A man said the house of his friend was in a long street,
 * numbered on his side one, two, three, and so on,
 * and that all the numbers on one side of him added up exactly the same as all the numbers on the other side of him.
 * He said he knew there were more than fifty houses on that side of the street,
 * but not as many as five hundred.


 * Can you discover the number of that house?