Four friends A, B, C, D are sitting in a coffee shop. A and B are sitting face to face. D is not sitting face to face. D is not sitting next of A but can see the facial expression of A clearly. B is talking to C who is sitting opposite to him who are sitting together? 

Some boys are  sitting in a row. P is sitting fourteenth from the left and Q is seventh from the right. If there are four boys between P and Q, how many boys are there in the row ?

B is twice as old as A but twice younger than F. C is half the age of A but is twice older than D. Who is the second oldest? 

Shailendra is shorter than Keshav but taller than Rakesh. Madhav is the tallest. Ashish is a little shorter than Keshav and little taller than Shailendra. If they stand in the order of increasing heights, who will be the second ? 

A class of boys stands in a single line. One boy is nine tenth in order from both the ends. How many boys are there in the class? 

Ravi is 7 ranks ahead of Summit in a class of 39. If Sumit's rank is seventeenth from the last, what is Ravi's rank from the start?