Weigh keys
If you have 9 keys, and a scale in a haunted house, and one key is heavier than the other ones. You need to find the key that is heavier than the rest to escape. What is the fastest way you figure out which key is the heaviest? (Fastest ways meaning using the scale the least amount of times)
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1 solution
Divide 9 keys in three groups i,e 3, 3. & 3
1st step: First take two groups of keys nd put on scale at each side, (if it shows equal in weight then take third group, other wise)
2nd step: take up heavier group of three keys(in continuation of 1st step) nd put up two keys on scale, one at each sides, if any one find heavier then it is right key, other wise third one will be heavier.