If you have 3 apples and you shared them with one friend how much do you have

That would depend on the amount of apples or perhaps apple slices being shared to this one friend. If 1 apple, you have 2. If you 2 apples, you have 1 left. If three apples, you have zero left. Basic addiction and subtraction can be used to determine the amount of apples left.

Well if you have 3 apples and you share them equally with one friend, both of you would have 1 apple and a half but if you share the 3 apples with one friend, you would have 0.