The world of A Hen and a Half is full of hard to believe situations, confusing paradoxes, party tricks, conjectures, and lateral thinking problems.

Magic tricks, puzzles and brain teasers will keep the most discerning readers engaged and fascinated. Curious conundrums have unusual solutions or use interesting arithmetical tricks. Favourites are situations and solutions to problems, that at first glance appear to be incorrect, paradoxical, or even impossible.

Yet in the world of A Hen and a Half we can learn to use extremely basic mathematical and scientific principles to solve many different problem types. Drawn from Tarquin's books, we explore different puzzle types taking our lead from A Hen and a Half - the 2023 publication from John Driscoll - see the link below. Links to other puzzle sources are on the puzzle pages.

Why A Hen and a Half?
“If a Hen and a half, lay an Egg and a half in a Day and a half,
how many eggs would 3 hens lay in a week?”

This should be a relatively easy puzzle to solve quite quickly in one’s head, but, maybe surprisingly, when put on the spot, few people get the answer right, first time.
Before you carry on, give yourself 30 seconds or so (but not longer) to work this out in your head – don’t write anything down or use your calculator, just find the first, best answer you come up with, before reading any further. 

A Hen and a Half by John Driscoll