Hi friends, I read the book of Quantities aptitude by R. S. Agarwal. This was the best book in 90’s.and this book is also very popular now days. We can learn basic concept, and practice the important question asked in various exams. One drawback of this book is the solution of this book is in very long methods. This is impractical for the competition now days. Because exam are time oriented. Solution of question should be based on short trick also. So that student can learn basic concept as well as short trick.Thanks