Appendix: Solutions
Idea 1: Who owns the zebra?
This problem can be solved by analytical and logical thinking – deductive logic – and persistence! It is necessary to compile a matrix.
Roughly halfway through the problem-solving process there are two forks in the road, or mental leaps. The only way to find out which way to go is by trial and error. If you choose the wrong road, you have to retrace your steps. You can see now why the world record for finding the solution is 10 minutes!
The following is one way of solving the problem.
Keep working through the facts from 1 to 15 in sequence.
Concentrate on clues for which there is only one answer. That is:
1 There are five houses, each with a front door of a different colour, and inhabited by people ...
