# The Tripan Balance

The tripan balance is used for comparing different weights. For example, when the pans carries 7 balls,5 balls and one is empty. The heaviest tilt to lowest level while the empty pan is at the highest level. In case of the same number of balls on two pans, both pans tilts to same level.

Twelve solid balls looks identical but two of them is either lighter or heavier (say 1% different to normal balls). Trying the tripan balance, how much checkings will it takes to find out the odd balls?

• so 1 light, 1 heavy, 10 regular? Or may it be also 2 light/heavy and 10 regular? Aug 17, 2019 at 18:02
• 1 is lighter and 1 is heavier
– TSLF
Aug 17, 2019 at 18:05
• The solution becomes more interesting if the difference in weight of both odd balls is the same from the regular balls. Both could be in the same pan and would mean all three pans are at same height. Aug 17, 2019 at 18:15
• @Abbas - i see what you mean. I just found there are many post of this type
– TSLF
Aug 17, 2019 at 19:09