Hang on - someone's making money from solving puzzles?? Anyway...
The family planning one is the gender-reversed version of the Chinese 1-child-system problem:
Chinese families were only permitted to have one child, to stem the population explosion.
However, farming families said they needed a son to take over the business.
So an exception was made - In rural communities, you could keep having children, if they were female, until the first male was born.
What effect did this have on the rural gender balance?
I do like these counter-intuitive problems. Thanks.
The Hidato wasn't so bad. I have often thought we should have a video series of our own explaining how to solve each of the common types - a video version of the walkthroughs on here.