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Two fathers and their two sons go fishing together. They each catch one fish to take home with them. They do not lose any fish, and yet when they arrive at home they only have three fishes.
How can this be?
This is how it can be!
Source
What's the matter?
There are grandfather, father & grandson. So there are 2 fathers viz. father & grandfather while there are 2 sons viz. father & grandson! Three generations on the mission.
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| Three Generations |
You are given eight coins and told that one of them is counterfeit. The counterfeit one is slightly heavier than the other seven. Otherwise, the coins look identical. Using a simple balance scale, how can you determine which coin is counterfeit using the scale only twice?
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| Identify The Fake Coin |
This is how it can be found!
Source
Why it was asked to?
1. Make a group of 3 coins each. Weigh these groups against each other.
2. If both groups weigh equal then weigh remaining 2 against each other. Heavier coin would be easily identified.
3. If one of group is heavier, then take out coins of this group.The counterfeit coin is among them.
4. Now weigh 2 of 3 coins of this group against each other.
5. If both are equal then obviously third one is counterfeit.
6. If one of them is heavier then obviously that one is counterfeit.
