Riddle: There was an old bridge.It was 2 km.the maximum
capacity it could hold 5000 kg,so only one car could go at a time.One day a car with full petrol weighed exact 5000 kg.Now even a bit of stone of 1 g falls on the bridge will break.
When the car finished 1 km 3 kg bird came and sat on the bridge did not break?????Why???
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