30.
In a certain code language,
M & N means โM is the son of Nโ,
M @ N means โM is the brother of Nโ,
M $ N means โM is the father of Nโ,
M # N means โ M is the mother of Nโ.
Based on this, how is E related to A, if โA # B $ C @ D & Eโ?