hmm. why is it not B? if u know the prices per gallon, u know how much water u need to add to each one in order to make them worth 480.
or the questions is how much when milk I + Milk II is mixed?
The question says that a mixture has milk type I and milk type II and now we need to add water to make the average value = $480. So how much water needs to be added?
To find the volume of water, you need to know the price of all three - milk type I, milk type II and water. You also need the volume in which milk type I and milk type II were added.
B alone isn't sufficient because it just gives you the price of milk type I and type II. We don't know the volume of these two. Even when you have both statements 1 and 2, you do not know the price of water (which may not be assumed to be available free of cost)
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