In a row of books a book of English is 16th from left end of row. A book of Mathematics is 12th from the right end. If the Mathematics book is 6th to the right of the English book, then how many total books are in the row?

Ajit is ranked seventh from the top and twenty-fifth from the bottom in a class. How many students are there in that 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? 

M is longer than B but shorter than P. K is longer than M. R is shorter than B. Who is the longest of them? 

In a row of boys, Srinath is 7th from the left and Venkat is 12th from the right. If they interchange their positions, Srinath becomes 22nd from the left. 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? 

In a row of girls, if Sujata is 10th from the left and Namrata is 9th from the right, interchange their positions, Sujata becomes 23rd from the left. How many girls are there in the row? 

In a row of cars, red car is 14th from left and 23rd from right. How many cars are there in the row?