Question

A+b means a is the son of b a-b means a is the wife of b then p+r-q?

Answer 1

p+r-q= ?

p+r means p is the son of r.

and
r-q means
r is the wife of q

so it' means wife of son

Answer 2

p+r = p is son of r and r-q = r is wife of q so mother is r and father is q and p is their son...... hope it helps....