$B$ is twice as old as $A$ but twice younger than $F$. $C$ is half the age of $A$ but twice the age of $D$. Which two persons form the pair of oldest and youngest?

Seven executives $P, Q, R, S, T, U$ and $W$ reach office in a particular sequence. $U$ reaches immediately before $P$ but does not immediately follow $S$. $R$ is the last one to reach office. $T$ follows immediately after $P$ and is subsequently followed by $W$. Among the executives,who reaches the office first?

$(i)$ $A, B, C, D, E, F$ and $G$ are sitting on a wall and all of them are facing east.
$(ii)$ $C$ is on the immediate right of $D$.
$(iii)$ $B$ is at an extreme end and has $E$ as his neighbour.
$(iv)$ $G$ is between $E$ and $F$.
$(v)$ $D$ is sitting third from the south end.
Name the person who should change places with $C$ such that he gets the third place from the north end.

In a pile of reading material,there are novels,story-books,dramas,and comics. Every novel has a drama next to it,every story-book has a comic next to it,and there is no story-book next to a novel. If there is a novel at the top and the total number of books is $40$,what is the repeating order of the books in the pile?

$(i)$ Eleven students,$A, B, C, D, E, F, G, H, I, J$ and $K$ are sitting in the first row of the class facing the teacher.
$(ii)$ $D$,who is to the immediate left of $F$,is second to the right of $C$.
$(iii)$ $A$ is second to the right of $E$,who is at one of the ends.
$(iv)$ $J$ is the immediate neighbour of $A$ and $B$ and third to the left of $G$.
$(v)$ $H$ is to the immediate left of $D$ and third to the right of $I$.
Which of the following groups of friends is sitting to the right of $G$?

There are five persons $P, Q, R, S$ and $T$. One is a football player,one is a chess player,and one is a hockey player. $P$ and $S$ are unmarried ladies and do not participate in any game. None of the ladies plays chess or football. There is a married couple in which $T$ is the husband. $Q$ is the brother of $R$ and is neither a chess player nor a hockey player. Who is the wife of $T$?