If you have a 300 ml bottle and a 500ml bottle. How many time do you need to pour water the bottle fully and use the bottle to gain 400ml of water?
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First pour water into 500ml bottle and then pour the water into the 300ml bottle fully and throw away the 300ml water and pour the remaining 200ml water into the 300ml bottle and once again pour water into the 500ml bottle and pour the water into the 300ml bottle and you will get 400ml water remain in the 500ml bottle.