1."I just made up another puzzle with Kalotan measurements," said Joe. There's a perfectly square box close up to the wall, and a ladder against the wall just touching one edge of the box." Don nodded. "An old idea," he declared. "How far is the foot of the ladder from the wall, and how high up the wall is its top?" "That's for you to get," replied Joe. "The ladder is 221 kells long, and the edges of the box under it are 60 kells." You try!

Ladder top 196 kells up the wall

Ladder top 168 kells up the wall

Ladder top 204 kells up the wall