Answer:
How many letters are there in the English alphabet?
I have branches but no fruit trunk or leaves. What am I?
I am useless when together but useful when I am broken apart. What am I?
I start with T end with T and within me is T.
My rings are not worth much, but they do tell my age. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.