9 Marbles
Logic
Level
2
There are 9 marbles. They all weigh the same except for one, it weighs more. You are allowed to use a weighing scale twice. How do you figure out which one weighs more? What is the order you put the marbles in?
2,2,5
4,1,4
3,5,1
3,3,3
4,4,1
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1 solution
You start with putting any three marbles on either side so there are three left. Then, if one weighs more, then you measure two of those ones. If they both weigh the same then it is the last one out however, if one weighs more than it is that one.