Add new comment

Permalink
Comment

The ages of the children can be 1 1 36, 1 2 18, 1 3 12, 1 4 9, 1 6 6, 2 2 9, 2 3 6, and 3 3 4.
The sum of their ages is respectively 38, 21, 16, 14, 13, 13, 11 and 10. So the number of the house next door is 13, otherwise he would have known their ages. He needs the third clue; there is an eldest one. So the ages of the chidren are 2 2 and 9.

Hub

Filtered HTML

  • Web page addresses and email addresses turn into links automatically.
  • Allowed HTML tags: <a href hreflang> <em> <strong> <cite> <code> <ul type> <ol start type> <li> <dl> <dt> <dd>
  • Lines and paragraphs break automatically.
  • Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.