Henry Ernest Dudeney/Puzzles and Curious Problems/47 - The Quarrelsome Children

by : $47$

 * The Quarrelsome Children
 * A man married a widow, and they each already had children.
 * Ten years later there was a pitched battle engaging the present family of $12$ children.
 * The mother ran to the father and cried,
 * "Come at once! Your children and my children are fighting our children!"


 * As the parents now had each nine children of their own, how many were born during the ten years?