In the Jhanke rank, Prabha is 12 places ahead and Prabha is 15th from the last student. If the tableau is 4th in order of merit, then how many students are there in its class?

A is 13th from the top, B is 18th from the bottom. When A and B change their position then A becomes 21th from top. What is the new position of B from bottom? 

P runs faster than T but not as fast as Q. Q runs faster than R but not as fast as S. Who runs fastest among them?

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? 

In a row of cars, blue car is at the bottom end. There are 18 cars between yellow and blue car. There are 8 cars between red and blue car. If there are 6 cars above yellow car, then how many minimum cars are there in the row?

In a row there are 6 boys between A and B and A is being the first boy in the row. There are 3 boys between B and C. If there are 12 boys after C, then how many maximum boys are there in the row?

Five girls are sitting facing towards the north. Rekha is between Shalini and Neetu. Pooja is to the immediate right of Neetu and Shalini is to the immediate right of Neha. Who is sitting in the middle?