In a city of known number of residents find the minimum number of heads with same number of hairs when maximum number of hairs is also known. Read on...
In Liar, Truth-teller, Random-Answerer Riddle, a traveler can ask two questions to decide which is the safe path out of two. What to ask?
In liar and truth-teller riddle, to know the safe path, a traveler can ask only one question to any one of a habitual liar or a truth-teller. What to ask?
Remove 4 sticks to leave 3 triangles in hexagonal wheel matchstick figure. Recommended time to solve 8 minutes. Hint: First solve remove 3 to leave 4.
Move 3 matches to make 3 squares from the Tic Tac Toe matchstick figure. How many unique solutions can you find? Recommended time to solve 5 minutes.
