An interesting puzzle
Read this up in the book “Mathematical Circus”.
You have 2 green balls, 2 yellow balls and 2 red balls. One ball of each color is 11 pounds each. The other ball of each color is 9 pounds each. You have a scale and pan balance. (meaning you can compare the weights of two sides – which is heavier and which is lighter but you never know the exact weight).
What is the least number of weighings required to find out which are the three heavier balls and which are the lighter balls?
Send me personal message with the reasoning.