Earlier today I set you the following two puzzles: Here they are again with solutions.
1. Neigh bother
A stud owner specialises in breeding purebred Lipizzaners, Thoroughbreds and Shire horses. The breeder is asked by a client for a foal which is one third Lipizzaner, one third Thoroughbred and one third Shire. How can she breed one?
I like this puzzle because initially it sounds impossible. However, once you start breeding different generations, the answer follows easily.
Let the three breeds be x, y and z.
Generation 1. Breed each type together. There will be three types of foal, each which is half and half: xy, yz and xz.
Generation II: Combine two of these, say xy and yz, which will give you a foal that is xyyz, i.e half y, quarter x and quarter z.
Generation III: Combine xyyz with xz from generation 1, which creates xxyyzz, i.e a horse that is a third each breed.
I asked a horse breeder whether this was the type of thing a breeder might do. He said: “Only if they were young (you’re talking of at least 5-6 years a generation), wealthy – and nuts….” Oh well, who says maths needs to have applications!
2. Grey matter
Solution: If you were looking for a number (as I was when I saw this puzzle) you fell into the trap. I’ll let Sunil explain in his own words. And you will understand why I included the puzzle after one about horses. I was only trying to help.
I hope you enjoyed today’s puzzles. I’ll be back in two weeks.
Thanks to Gilad Benjamini for the first puzzle and Sunil Singh for the second. Sunil is an author, speaker and math storyteller from Toronto.
I set a puzzle here every two weeks on a Monday. I’m always on the look-out for great puzzles. If you would like to suggest one, email me.
I give school talks about maths and puzzles (online and in person). If your school is interested please get in touch.