Of all of your levels, I am able to solve maybe a quarter of them. This was another one that I was able to finish! Yea! I will keep trying on the other three quarters of them!
Now the answer to your poser question:
First you divided the 27 balls into 3 groups of 9, groups A, B & C.
Weigh groups A and B. If the scale is balanced, the heavier ball is in group C. If the scale is unbalanced, the heavier ball is in group A or B.
Divide the heavier group, say group C, into three groups of 3, groups C1, C2 and C3.
Weigh groups C1 and C2. If the scale is balanced, the heavier ball is in group C3. If the scale is unbalanced, the heavier ball is in group C1 or C2.
Divide the heavier group, say group C3, into three groups of 1, groups C3a, C3b, and C3c.
Weigh groups C3a and C3b. If the scale is balance, the heavier ball is in groups C3c. If the scale is unbalance, the heavier ball is in group C3a or C3b. Either way, you have identified the 1 heavier ball in just 3 weighings.
Thanks for the fun! You levels are always a challenge as well as your poser questions! Keep them coming!
