About this creation
An old man ordered 6 gold bricks
But one of them seems to be lighter because of bad quality control.
Here please help the old man by using the balance behind (max. 2 times) to find the special gold brick.
Answer is:
1st balance : 3 vs 3 (randomly select 2 from the lighter side for the 2nd balance)
2nd balance : 1 vs 1 (if equal, the left over is the one / if either one lighter, that it is)