You have four closed boxes as shown:
While you know all four types of food are inside and each box only contains one type of food, you also know that only one of the boxes is labeled correctly.
What’s the minimum number of boxes that you need to open to be guaranteed (regardless of luck) to find out which one is labeled correctly? Riddle Answer
How many triangles can you find in the picture?
A hospital has 16 isolation rooms. Each room has a patient with a different illness.
Patient in room 13 recovers and wants to say goodbye to each patient. The problem is that if he visits a patient twice, he becomes ill again.
How does he visit each patient only once and exit from room 4? Riddle Answer
Old Farmer Palmer has a herd of cows, but he always seems to forget how many animals there are. When he counts them he just makes sure he can see 6 cows from each window of his house.
One night, however, Russell the Rustler took away half of the herd. Farmer Palmer didn’t notice for ages because the next morning he could still see 6 cows from each window. How was it done? Riddle Answer
You have 8 balls numbered 1, 3, 5, 7, 9, 11, 13 and 15. Select 3 balls and put them into the circles such that the sum of the numbers on them add up to 30.