>>Ooops, sorry if I shouldn't have replied.
>>BTW, its only the same if the boy thoroughly stirred the first mixture.
>
>I doubt it. The result should be independent of whether you mix a lot, a little, or not at all.
>
>Hilmar.

I just realised that, the only effect is to change the ratio of milk to water. Just from common sense, the volume in each glass remains the same & there is no change in volumes of milk & water, so the milk:water/water:milk mixtures must be equal, regardless of mixing.