A boat is going in a river and the boat is filled up with animals and persons ok and the boat is the exact weight if any needle also falls in the boat will sink in the river so at that exact time there is one cow it is pregnant she gave birth to the baby but the boat didn't sink why?
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Explanation:
it is so because when the cow is pregnant she has the baby inside and when it comes out , the weight on the boat is not going to change