103.--PAINTING THE LAMP-POSTS.

From Amusements in Mathematics by Henry Ernest Dudeney.

Pat must have painted six more posts than Tim, no matter how many lamp-posts there were. For example, suppose twelve on each side; then Pat painted fifteen and Tim nine. If a hundred on each side, Pat painted one hundred and three, and Tim only ninety-seven

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103.--PAINTING THE LAMP-POSTS.: Amusements in Mathematics by Henry Ernest Dudeney | amphi