Direction : In the following questions, the symbols #, &, @, * , $, % and ©…

Direction : In the following questions, the symbols #, &, @, * , $, % and © are used with the following meanings as illustrated below. Study the following information and answer the given questions:
P#Q - P is the son of Q.
P@Q - Q is the child of P.
P©Q - P is the parent of Q.
P$Q - P is elder than Q.
P*Q- P is the husband of Q.
P&Q- Q is the daughter-in-law of P.
P%Q- P is the wife of Q.

If H*M©O$N#M, the age of N is 20 years and age of H, is 40 years then what is the probable age of O?