fold the 3 shapes below into rectangles with two layers of paper everywhere. the white part of the image is the puzzle. I'm sure you noticed the pattern in the shapes. now extend it and solve all shapes of that pattern. this will need a general solution. in case it's not clear, the pattern is a l...

In 2025, Memorial Day will be on May 26. Also, in 2026, Memorial Day will be on May 25. Notice that the last two digits of the year and the Memorial Day date in May have just switched places. The same pattern also holds for the years 2028 and 2029 in the 21st century (with Memorial Day on May 29 ...

On the island of Friends and Foes, every citizen is either a Friend (who always tells the truth) or a Foe (who always lies). Seven citizens are sitting in a circle. Each declares “I am sitting between two Foes”. How many Friends are there in the circle? Clarification: You can assume that each pe...

Suzie was busy working in her office and helping compile Clayton’s expenses for which he has a daily elevenses allowance of less than £10 when she noticed that the three digits making up the amount of money he had spent on his elevenses and the balance of the amount unclaimed was a rearrangement ...

Solve on Penpa+ Across 1. Bravo! First-rate type of code you texted back... It reveals almost nothing! (5) 5. Standard for Brits but not for the French or for Germans, who cut quantity in half (6) 9. Cyclops and Storm both have one (3) 10. Arab paramilitaries faced with counter intelligence? (5)...