SOLUTION IF #8 IS EITHER HEAVY OR LIGHT

 

Here is the solution if the unique weight is number 8 and it is Heavier than all others, followed by solution if it was Light.

Weigh #1
Place 1 2 3 4 on Left and Place 5 6 7 8 on Right Solver now knows Unique Weight is either 1 2 3 4 as Light OR 5 6 7 or 8 as Heavy

Weigh #2
Place 1 2 6 on Left and Place 3 4 5 on Right
So Unique weight must be either 7 or 8 as Heavy

Weigh#3
Place 7 on Left side and place 8 on Right side
Solver would see that Right is Heavy so it is 8 Heavy
***********
Now assume instead that 7 is Light instead of Heavy.

Weigh#1
Place 1 2 3 4 on Left and Place 5 6 7 8 on Right
Either 1 2 3 or 4 is Heavy Or 5 6 7 or 8 is Light

Weigh#2
Place 1 2 6 on Left and Place 3 4 5 on Right
Solver would see that scale is in balance so it must be either 7 or 8 is Light

Weigh #3
Place 7 on Left Place 8 on Right
Solver would see that Right side is Light so Unique weight is 8 as Light


Return to Start Page