Posts filed under ‘.puzzle’

Caught in the Rain


This is a great 19th century variation on river crossing puzzles.

A Preacher, Deacon and Janitor have to get home from Church with their wives. The only umbrella is only large enough for two.



April 3, 2017 at 8:25 pm Leave a comment

April Birthday Puzzle

Panda Math Puzzles

April and Bernard just met Cheryl. “When’s your birthday?” April asked Cheryl.

Cheryl thought a second and said, “I’m not going to tell you, but I’ll give you some clues.” She wrote down a list of 10 dates:

May 15 — May 16 — May 19

June 17 — June 18

July 14 — July 16

August 14 — August 15 — August 17

“My birthday is one of these,” she said.

Then Cheryl whispered in April’s ear the month — and only the month — of her birthday. To Bernard, she whispered the day, and only the day.

“Can you figure it out now?” she asked April.

April: I don’t know when your birthday is, but I know Bernard doesn’t know, either.

Bernard: I didn’t know originally, but now I do.

April: Well, now I know, too!

When is Cheryl’s birthday?

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April 16, 2015 at 5:41 pm Leave a comment

Four Fours

Beremiz shows how to make each of the numbers from zero to ten by combining exactly four 4s.

The Man Who Counted by Malba Tahan: Ch.7: Going to Market

Brazil 4 mathsThe Definitive Four Fours Answer Key

Four fours is a mathematical puzzle. The goal of four fours is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four (no other digit is allowed).

April 20, 2011 at 6:04 pm Leave a comment


April 3, 2011 at 3:05 pm Leave a comment


April 2, 2011 at 1:39 pm Leave a comment

Sam Loyd’s Billboard Puzzle

April 2, 2011 at 1:33 pm Leave a comment

Quarrelsome Neighbors

April 2, 2011 at 1:30 pm Leave a comment

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