hard maths question/riddle, help!?

KS

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there is a bottle with full of water that holds 5ml, there is a bottle with full water that holds 3ml, and a completely empty bottle. but we wat 4ml worth of water in the empty bottle. How do we do this?
 
Depend how big the empty one is...

My way:

Pour both the 5mL and 3mL into the empty bottle, that way you have 8mL, then drain half, which would be 4mL, and you're left with 4mL
 
fill 5 ml twice, put it in empty then poor out 2 lots into 3 ml. simple

*pour lol

@Grimm how do you know how much is half, as then you're still estimating and not getting an exact measure.
 
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