P knows more than E. Q knows as much as E. R knows less than G. E knows more than G. Who is the most knowledgeable person of all?
- E < P.
- Q = E.
- R < G.
- G < E.
We can examine the right side and shortlist P, G and E. Out of these E and G appear on left side also, so we can strike them away. We are left with P.