Eight persons D, E, F, G, H, I, J and K standing in a

Solution

D is fourth tallest person. J is taller than D. J is two persons taller than K. J  >  _____ > K > D >  _____ > ______ >  _____ > _____  ….. (I) _____  >  _____ > J > D >  K > ______ >  _____ > _____  ….. (I)   G is taller than both E and H. F is taller than G.  H is two persons shorter than I. The number of persons taller than I is more than the number of shorter than G. Case 2 will get discarded. J  >  F > K > D >  G > I  >  E > H  ….. (I) _____  >  _____ > J > D >  K > I >  _____ > H  ….. (I) Therefore, the final arrangement is as follow: J(Tallest) > F > K > D > G > I > E > H(Shortest) Six persons are shorter than F.