Via Link Grabber I found a 136 page pdf-file with 150 puzzles and they vary from simple ones to the more difficult ones. They are interesting even for those who are not skilled in maths, including solutions.
The puzzles are written by Shakuntala Devi the world famous mathematical genius from India. She is a self taught prodigy who never had any formal education. She is also known as the human computer.
It is a book of puzzles, and the puzzles in this book are interesting and will involve the reader while solving them. The puzzles are short in length but will force you to exercise your brain, and use your logical skills. The puzzles are of a wide range from the modern ones to those from an ancient text.
All together, a good book with which one can pass some time, trying these puzzles. Maybe you need to download WinRAR to unzip the pdf-file. Happy Puzzling!