Three pennies and three nickles are arranged in a row. The pennies are red and nickles are green in color. The goal is to move them so that the coins are again in a row, with all pennies to the right and nickels to the left.
Each move consists of moving a pair of adjacent coins, and sliding those two coins to a new position without rotating the coins. How can you achieve this (shown below) in three moves?
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.
Make the 10 coin pyramid on the left look like the inverted pyramid on the right by moving only 3 coins.
Below are 40 matchsticks arranged in a square grid.
What is the fewest number of matchsticks that need to be removed so that there are no squares (of any size) remaining?
Riddle Answer